Table 1

Baseline characteristics of patients with and without atopic dermatitis

VariablesAtopic dermatitisP values
Yes (n=8371)No (n=33 484)
Keloid patients, n (%)163 (1.95)532 (1.59)0.022
Period of developing keloid, median (IQR), years1.9 (0.8–4.3)9.0 (6.2–11.8)<0.001
Mean age at diagnosis of keloid, years33.1 (14.8)36.8 (14.4)<0.001
Age group, n (%)
 <404245 (50.71)16 980 (50.71)
 40–592601 (31.07)10 404 (31.07)
 ≥601525 (18.22)6100 (18.22)1.000
Gender, n (%)
 Men2946 (35.19)11 784 (35.19)
 Women5425 (64.81)21 700 (64.81)1.000
Degree of urbanisation, n (%)
 Urban5267 (62.92)20 463 (61.11)
 Suburban1332 (15.91)5665 (16.92)
 Rural1772 (21.17)7356 (21.97)0.008
Concurrent allergic disease, n (%)
 Asthma2127 (25.41)4323 (12.91)<0.001
 Allergic rhinitis4586 (54.78)12 028 (35.92)<0.001
 Allergic conjunctivitis4790 (57.22)14 089 (42.08)<0.001
Comorbidity, n (%)
 Hypertension2854 (34.09)7232 (21.60)<0.001
 Diabetes mellitus1968 (23.51)4508 (13.46)<0.001
 Hyperlipidaemia2893 (34.56)7059 (21.08)<0.001
 Chronic kidney disease1007 (12.03)2076 (6.20)<0.001
 Chronic liver disease2999 (35.83)7361 (21.98)<0.001
 Chronic obstructive pulmonary disease2238 (26.74)5050 (15.08)<0.001
 Stroke490 (5.85)994 (2.97)<0.001
 Coronary artery disease420 (5.02)909 (2.71)<0.001
 Mental disorders1511 (18.05)3794 (11.33)<0.001
 Alcohol attributed disease311 (3.72)765 (2.28)<0.001