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. Author manuscript; available in PMC: 2021 Jul 2.
Published in final edited form as: Allergy. 2021 Jan 31;76(7):2241–2245. doi: 10.1111/all.14738

Table 1.

Characteristics of study children (n=1,128).

Characteristic All children Eczema (n=216) No eczema (n= 912) P
Sex, boy, n (%) 632/1,128 (56.0) 121/216 (56.0) 511/912 (56.0) 0.99
Age, years (mean ± SD) 6.4±0.4 6.4±0.4 6.4±0.4 0.35
Height, cm (mean ± SD) 118.7±5.6 118.5±5.9 118.7±5.5 0.68
Weight, kg (mean ± SD) 22.4±4.7 22.9±5 22.3±4.7 0.10
Body mass index, kg/m2 (mean ± SD) 15.8±2.4 16.2±2.7 15.7±2.3 0.01
Atopy, n (%) 716/1,089 (65.8) 163/205 (79.5) 553/912 (62.6) <0.001
Breastfeeding, n (%) 566/1,128(50.2) 114/216(52.8) 452/912(49.6) 0.39
Prenatal environmental tobacco smoke, n (%) 472/1,128 (41.8) 84/216 (38.9) 388/912 (42.5) 0.32
Parental history of asthma, n (%) 125/1,121 (11.2) 37/213 (17.4) 88/908 (9.7) 0.001
Parental history of allergic rhinitis, n (%) 715/1,127 (63.4) 159/216 (73.6) 556/911 (61.0) 0.001
Parental history of atopic dermatitis, n (%) 301/1,112 (27.1) 81/214 (37.9) 220/898 (24.5) <0.001
Birth season, n (%) 0.49
 Spring (March to May) 257/1,128(22.78) 52/216 (24.1) 205/912 (22.5)
 Summer (June to August) 280/1,128(24.82) 59/216 (27.3) 221/912 (24.2)
 Autumn (September to November) 322/1,128(28.55) 53/216 (24.5) 269/912 (29.5)
 Winter (December to February) 269/1,128(23.85) 52/216 (24.1) 217/912 (23.8)
PM2.5, μg/m3 (median/IQR) 26.1/4.3 26.7/4.6 26.0/4.3 0.08
Ambient temperature, °C (median/IQR) 22.3/2.9 22.4/2.9 22.3/3.0 0.95
Relative humidity, % (median/IQR) 76.5/1.6 76.6/1.8 76.4/1.5 0.33

Abbreviation: SD: standard deviation; PM2.5: particulate matter with an aerodynamic diameter of 2.5 μm or less; IQR: interquartile range.