|
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
|
