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Original Article
2011:77:3;300-306
doi: 10.4103/0378-6323.79699
PMID: 21508568

A measurement of the stigma among vitiligo and psoriasis patients in India

Rajan Pichaimuthu, Premkumar Ramaswamy, Kar Bikash, Richard Joseph
 Schieffelin Institute of Health-Research and Leprosy Centre, Karigiri-632 106, Dist-Vellore, Tamil Nadu, India

Correspondence Address:
Premkumar Ramaswamy
Schieffelin Institute of Health-Research and Leprosy Centre, Karigiri-632 106, Dist-Vellore, Tamil Nadu
India
How to cite this article:
Pichaimuthu R, Ramaswamy P, Bikash K, Joseph R. A measurement of the stigma among vitiligo and psoriasis patients in India. Indian J Dermatol Venereol Leprol 2011;77:300-306
Copyright: (C)2011 Indian Journal of Dermatology, Venereology, and Leprology

Abstract

Background and Aim: The aim is to measure and to compare the level of social participation experienced by vitiligo and psoriasis patients in their domestic and social life in an Indian context. Methods: A cross-sectional comparative study with a sample of 150 cases each of psoriasis and vitiligo, a total of 300 subjects. A detailed clinical assessment of these two conditions, including the extent of lesions on the affected body parts, socioeconomic status and participation levels in social and domestic lives, was done. Results: The result showed that, 17.3% of vitiligo patients participated minimally in domestic and social life, whereas 28% of psoriasis patients had this problem (P=0.027). Extreme participation restriction was observed only among psoriasis patients (2.7%). Psoriasis patients also faced significantly more restrictions in a number of day-to-day life situations such as, less confidence in learning and applying knowledge, difficulties in meaningfully participating in major life areas like, work, education and employment, and also in community, social and civic life (all three domains P<0.0001), to vitiligo patients. Conclusion: Both psoriasis and vitiligo patients suffered moderate to severe restriction while participating in their domestic and social life. Of these two groups, psoriasis patients faced significantly more restrictions in a number of day-to-day life situations. The Indian population of this study was predominantly dark-skinned and hypo-pigmentation as seen in vitiligo is much more noticeable than psoriatic red patches. However, the results showed that the component of hypo or hyperpigmentation of the skin is not the only factor leading to participation restrictions.
Keywords: Stigma, participation scale, psoriasis, social issues, vitiligo

Introduction

Vitiligo and psoriasis are cosmetically disfiguring conditions that are commonly seen in Indian dermatological outpatients′ clinics. Psoriasis goes further than this with systemic association of arthritis. The real prevalence of these conditions still remains unknown, as no epidemiological surveys have been conducted so far. However, calculated from the dermatological outpatients′ records the prevalence of vitiligo ranges between 3 and 4% globally, with Mexico and India having the highest incidence of this condition. [1] Similar estimates with psoriasis suggest its prevalence ranging between 0.8 and 5.6%. [2]

Earlier studies on the psychosocial aspects have shown that vitiligo may have a profound impact on self-image, self-esteem and interpersonal relationships. [3] In addition, the patient can experience stigmatization, embarrassment and self-consciousness about vitiligo. [4] There were more such studies on psoriasis than vitiligo, for example on the aspect of social stigma due to psoriasis [5],[6],[7],[8],[9],[10],[11],[12] and on establishing social relationships. [12] There were also four studies comparing the psychosocial aspects in psoriasis and vitiligo. [13],[14],[15],[16] The first three studies were on the psychiatric morbidity of these conditions, two from India-one suggested that it is marginally higher in vitiligo than psoriasis [13] and the other study had the opposite result. [16] The third, from Egypt had shown a slightly lower level of psychiatric morbidity in people with vitiligo than those with psoriasis. [14] The fourth study from the United States of America compared the social functioning of patients with these two conditions and found that psoriasis patients had more social dysfunction than patients with vitiligo in a self-rated severity scale. [15]

This study made a specific attempt to quantify social and domestic participation restrictions that patients having the above two stigmatizing dermatological conditions experience from an Indian perspective and compares the severity between both these conditions. Besides, we made an attempt to use a recently developed tool called participation scale (P-scale) [17] which uses the framework of the International Classification of Functioning, Disability and Health (ICF) to measure social participation in such stigmatizing diseases. [18] It has so far not been used to measure these two conditions. The use of the word participation is based on the ICF terminology and participation restriction in this study is defined as problems an individual may experience with involvement in life situations. This study intentionally did not use relevant quality of life questionnaires such as short form (36) health survey (SF-36), a quality of life measure for patients with Skindisease (Skindex), dermatology life quality index (DLQI), the impact of chronic skin disease on daily life (ISDL) despite the fact that they have been validated for skin diseases because the ICF model was hardly elaborated theoretically in these tools.

The objectives of the study were to find out in groups of people affected by these disorders, and also compare to a control population without dermatological conditions:

  1. the extent of social participation and the differences between these groups;
  2. participation domains that were significantly affected.

Methods

Sample

The data was collected from the dermatology outpatient clinic in the southern part of India. Patients attending these clinics were a mixture of the rural population from the neighboring villages as well the urban residents of the nearby town.

Study design

It was a cross-sectional comparative study which was completed in a period of 10 months from March to December 2006. Ethics′ clearance for this study was obtained from the institution′s research committee. There were no earlier participation restriction studies on vitiligo and psoriasis. Therefore, this study adopted an earlier work in leprosy, [19] which used the p-scale to identify the subjects who have restriction in social and domestic life. It concluded that 40% of their study population suffered from participation restriction. Using this 40% as p, with 95% confidence interval and with d (allowable difference) of 20% of p, the minimum sample size needed was estimated as 144. A consecutive sample of 150 vitiligo patients and the same number of psoriasis patients who had consented and also met the following selection criteria were enrolled in the study.

  1. Psoriasis and vitiligo patients with no other stigmatizing diseases like leprosy.
  2. The patients should have no other skin disease with visible patches.
  3. The patients should be above 14 years of age.
  4. The patients should be free from psychiatric illness.

One of the researchers made certain that they were free from psychiatric illnesses. During the time of data collection no matching among cases or controls was attempted.

The subjects were classified sex-wise, and age-wise as adolescents (14 to 17 years); adults (18 to 60 years) and old age (61 years and above).

Instruments used

1. Socioeconomic status and standard of living index of NFHS-2 [20] was administered to both cases and controls. The interpretation for the household income was that if it was below Rs. 24,000/- per annum it was considered to be below the poverty line. The score for the standard of living was as follows: 0-14 indicated low standard of living; 15-24 the middle level and those who scored between 25-67 had a high standard of living.

2. Clinical profile of all the psoriasis and vitiligo cases such as the dermatological diagnosis and its type, and duration of the diagnosis, was noted. For these conditions the data of the percentage of the body surface area and body parts affected was elicited. The body was divided into nine parts as shown in [Figure - 1]. The samples were divided into three clusters based on the affected parts, such as (i) Exposed (1-6); (ii) non-exposed (7- 9); and, affected in both exposed as well in non-exposed body parts.

Figure 1: Body parts affected

3. Participation scale: This tool has been validated in India, Nepal and Brazil. [17] It measures the extent to which people participate in common social events. The key issue of stigma is that it excludes people from participating in such events. The Indian version has been translated into Hindi, Bengali, Telugu and Tamil and the Tamil version was used for this study, as it is the local language spoken in and around the study centre. Its intra-tester stability by Intra-class correlation coefficient (ICC) in Tamil language was 0.83 and inter-tester reliability in the same language was 0.80. The internal consistency reliability of the scale was checked with Cronbach′s alpha. It was 0.92. [17] The P-scale is an 18-item instrument (Annexure 1),[SUPPORTING:1] which covers eight out of the nine participation domains of the ICF. [18] A five-point rating scale is used to measure the level of participation for each item. For each subject the scores obtained for the 18 items were added up. If the score was 12 or less, people were considered not to have restriction in their domestic and social life situation. Scores of 13 to 90 represent restriction at different intensities; 13 to 32 as moderate, 33 to 52 as severe and 53-90 as extreme restrictions.

Procedure

Data collection was carried out on the same day over two sessions; the first was by BK who carried out the initial recruitment by diagnosing vitiligo and psoriasis. Those who fulfilled all the inclusion criteria of the study were considered for the data collection. The interviewer (PR) orally informed the subjects about the study and data was collected only from those who were willing to participate. The dermatology registrar administered the clinical profile instrument described above. Recruitment was done consecutively until the sample size was reached. After recruitment, the subjects were directed to PR who has been trained in the administration of the NFHS-2 and P-scale, to collect this information by the interview. This interviewer was blinded to the clinical profile of the samples.

Data analysis

The statistical package for social sciences (SPSS Inc., Chicago, IL) was used for all analysis. The dataset was analyzed using means, standard deviations, chi-square, ANOVA F and t-tests. A P value equal to or less than 0.05 was accepted as significant.

Results

Demographic characteristics are shown in [Table - 1].In this cross-sectional study, the vitiligo and psoriasis patients had comparable socio-demographic characteristics, except in the marital status. The mean age (SD) of vitiligo and psoriasis was 35.11 (14.69) and 42.13 (15.05), respectively.

Table 1: Demographic characteristics of psoriasis and vitiligo

[Table - 2] revealed that the duration of the disease was almost similar in both these groups. However, in this consecutive data collection, no psoriasis patients sought medical assistance when unexposed body parts were affected; also psoriasis patients had significantly more body parts and surface area affected.

Table 2: Clinical characteristics between vitiligo and psoriasis

[Table - 3] shows that participation restrictions in domestic and social life were more among psoriasis patients than among vitiligo patients. [Figure - 2] shows the different intensities of participation restriction. Extreme restriction was observed only among psoriasis patients.

Table 3: Participation level among psoriasis and vitiligo
Figure 2: Participation restriction at different intensities among psoriasis and vitiligo

[Table - 4]: Further investigations sought to establish which participation domains were most affected in their life situations. The mean differences between the participation scores of patients with psoriasis and vitiligo were significant in learning and applying knowledge as well as in meaningfully participating in their major life areas like work, employment and education activities compared with vitiligo patients (All three domains P<0.001).

Table 4: The level of participation among vitiligo and psoriasis patients in different domains

Discussion

Participation restrictions are problems experienced in any life situation, for example, in relationships or in employment. We specifically selected the participation scale to assess the above factors because it covered all but one of the participation components of the ICF and was designed for use in low and middle-income countries. The strength of this study is that it is the first of its kind to highlight the prevalence of participation restriction in patients with vitiligo and psoriasis. In addition, it was a rigorous single-blind study where both clinical and sociometric assessors did not have access to each other′s data. Besides, the data were collected from relatively large groups of patients and healthy controls.

Our results clearly showed that both vitiligo and psoriasis patients reported participation restrictions in sizeable percentages. At the same time, it was interesting to note that psoriasis patients faced more restrictions at a significant level (P = 0.027) than vitilgo patients in a number of day-to-day life situations. Moreover, psoriasis is the only condition in which some patients suffered extreme participation restrictions. It could be due to the fluctuating course of psoriasis, which is also symptomatic, whereas vitiligo patients would have become inured to their condition.

In the past, only one study from the United States (US), which compared the social functioning of these two conditions, found that psoriasis patients had more social dysfunction than patients with vitiligo in a self-rated severity scale. [15] Our study corroborates the above finding in terms of restrictions in domestic, work and social life. It is understandable that among the predominantly white population of the US a red patch due to psoriasis is more visible than a vitiligo lesion, and therefore, a psoriasis patient may suffer greater social dysfunction than a vitiligo patient. The Indian population of this study was predominantly dark-skinned, so that hypo-pigmentation as seen in vitiligo is much more noticeable than psoriatic red patches. One would therefore expect more severe social problems among vitiligo patients. Conversely, this study disagrees with such reasoning and shows clearly that the component of hypo or hyper pigmentation of the skin is not the only factor leading to participation restrictions.

The findings of this study show that a substantial proportion of patients with psoriasis had problems participating in major life areas like work, education and employment, and also in community, social and civic life [Table - 4]. A strong correlation was seen between the above findings and a number of studies from North America and Europe. For example, a large-scale national survey from the US suggested that psoriasis has a significant negative impact on overall work productivity. [21] Another US-based study found that 84% psoriasis patients reported that one of the worst things they experience was difficulty in establishing social contacts and relationships. [12] A Canadian study also indicated that moderate to severe psoriasis may have a substantial impact on the work productivity of patients with this disease. [22] A study from the UK reported that 14% of psoriasis patients discontinued careers at least once in their lives because of the appearance of their skin. [23] Another study from the same country stated that 15% of psoriasis patients experienced limited employment opportunities because of discrimination based on the appearance of their skin during job interviews. In addition, they take frequent sick leaves related to skin eruptions. Eighty-nine percent of patients reported embarrassment and shame and 42% experienced lack of self-confidence on account of their psoriasis. [24] This leads to the inference that, in the case of psoriasis a similar scenario of problems in participating in major life areas exists both in Eastern and Western populations.

Over-representation of married subjects among the psoriasis group is either due to the age factor or the stress a married life can bring about. In this study the mean (SD) age of vitiligo and psoriasis patients is 35.11 (14.69) and 42.13 (15.05) respectively [Table - 1]. Interestingly, in another Indian study that compared vitiligo and psoriasis patients, a similar mean age difference was observed. [13] With the increase in age the likelihood of a person being married is high in India where most weddings are arranged by parents. [25] An alternative inference worth considering is the physical, emotional and psychological stress a married life could bring about. This possibly aggravates the psoriasis signs and symptoms, thus more patients in married demographic groups attend the dermatological clinics.

One unanticipated but important finding of this study was delayed presentation to the dermatological clinic by psoriasis patients [Table - 2]-no psoriasis patients sought medical assistance when unexposed body parts were affected. For any disease, delay in treatment has its own implications. Therefore, one future direction to be taken is to look into why people with psoriasis delay in the help-seeking process. This could include cultural causes, social consequences, and patients′ lack of knowledge of the allopathic cure, and the consequences of delayed treatment. The second area which needs attention is to develop steps and remedies to be offered to these groups of patients to overcome participation restriction. Both these were beyond the scope of this project.

In summary, this rigorous single-blind study indicated that both psoriasis and vitiligo patients suffered moderate to severe restriction while participating in their domestic and social life. Of these two groups, psoriasis patients faced significantly more restrictions in a number of day-to-day life situations. The Indian population of this study was predominantly dark-skinned and hypo-pigmentation as seen in vitiligo is much more noticeable than psoriatic red patches. However, the results showed that the component of hypo or hyperpigmentation of the skin is not the only factor leading to participation restrictions.

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