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Table 1 Basic characteristics of the study participants

From: Residential exposure to air pollution and access to neighborhood greenspace in relation to hair cortisol concentrations during the second and third trimester of pregnancy

Characteristic n (%)
Age
 ≤ 25 17 (11.4)
 26–30 71 (47.7)
 31–35 44 (29.5)
 > 35 17 (11.4)
 Missing 0
Parity
 0 91 (61.1)
 1 43 (28.9)
 ≥ 2 15 (10)
 Missing 0
Pre-existing chronic diseases
 No 135 (90.6)
 Yes 12 (8.1)
 Missing 2 (1.3)
Pre-pregnancy Body Mass Index (kg/m2)
 Underweight (< 18.5) 8 (5.4)
 Normal (18.5–24.9) 84 (56.4)
 Overweight (25–29.9) 20 (13.4)
 Obese (≥30) 12 (8.1)
 Missing 25 (16.7)
Smoking before pregnancy
 Never 94 (63.1)
 Former smoker 21 (14.1)
 Missing 34 (22.8)
Alcohol consumption before pregnancy
 No 16 (10.7)
 Yes 99 (66.4)
 Missing 34 (22.8)
Ethnic background
 European 112 (75.2)
 Non-European 4 (2.7)
 Missing 33 (21.1)
Educational attainment
 Low (Basic level) 15 (10.1)
 Intermediate (Secondary school) 15 (10.1)
 High (Higher education) 85 (57.0)
 Missing 34 (22.8)
Pre-pregnancy employment
 No 7 (4.7)
 Yes 107 (71.8)
 Missing 35 (23.5)
Daily hair washing
 No 97 (65.1)
 Yes 18 (12.1)
 Missing 34 (22.8)
Season of 2nd trimester sampling (n=133)
 Autumn 28 (21.2)
 Winter 23 (17.3)
 Spring 38 (28.6)
 Summer 44 (33.1)
 Missing 0
Season of 3rd trimester sampling (n=81)
 Autumn 23 (28.4)
 Winter 21 (25.9)
 Spring 12 (14.8)
 Summer 25 (30.9)
 Missing 0
  1. Note: pre-existing chronic diseases include diabetes, asthma, cardiovascular diseases