Table 1.
Mapping of study characteristics of all studies included in this review
| Study characteristics (N = 69) | N (%) |
|---|---|
| Publication years | |
| 2009–2013 | 16 (23.19) |
| 2014-June 2018 | 53 (76.81) |
| Country of origin | |
| UK | 8 (11.59) |
| USA | 8 (11.59) |
| Poland | 8 (11.59) |
| India | 6 (8.70) |
| German | 5 (7.25) |
| China | 4 (5.80) |
| Japan | 4 (5.80) |
| Denmark | 2 (2.90) |
| Korea | 2 (2.90) |
| Italy | 2 (2.90) |
| Greece | 2 (2.90) |
| Malaysia | 2 (2.90) |
| Canada | 2 (2.90) |
| Spain | 2 (2.90) |
| Singapore | 2 (2.90) |
| Portugal | 2 (2.90) |
| Sweden | 2 (2.90) |
| Netherlands | 1 (1.45) |
| Turkey | 1 (1.45) |
| Iran | 1 (1.45) |
| Finland | 1 (1.45) |
| Ireland | 1 (1.45) |
| Egypt | 1 (1.45) |
| Study types | |
| Cross-sectional study | 43 (62.32) |
| Randomized controlled trial | 5 (7.25) |
| Review | 5 (7.25) |
| Systematic review | 3 (4.35) |
| Case-control study | 2 (2.90) |
| Prospective cross-sectional study | 2 (2.90) |
| Case series study | 2 (2.90) |
| Experimental design | 2 (2.90) |
| Qualitative study | 2 (2.90) |
| Letter | 2 (2.90) |
| Develop a rating scale | 1 (1.45) |
| Study population | |
| Psoriasis | 44 (63.77) |
| Atopic dermatitis | 10 (14.49) |
| Vitiligo | 9 (13.04) |
| Eczema | 3 (4.35) |
| Skin disease | 3 (4.35) |