Table 1 Characteristics of the cohort according to body mass index, age, number of previous childbirths, smoking status, education and gestational week of blood sampling
From: Perfluoroalkyl substances and time to pregnancy in couples from Greenland, Poland and Ukraine
Greenland | Poland | Ukraine | |
|---|---|---|---|
Maternal BMI | n (%) | n (%) | n (%) |
<20 | 56 (13) | 61 (30) | 93 (32) |
20-24 | 224 (50) | 122 (60) | 156 (54) |
25+ | 164 (37) | 17 (8) | 37 (13) |
Missing | 4 (1) | 3 (1) | 1 (0) |
Maternal age (yrs) | |||
<25 | 224 (50) | 28 (14) | 200 (70) |
25-29 | 93 (21) | 134 (66) | 61 (21) |
30+ | 117 (26) | 41 (20) | 22 (8) |
Missing | 14 (3) | 0 (0) | 4 (1) |
Previous childbirths | |||
0 | 138 (31) | 187 (92) | 227 (79) |
1 | 138 (31) | 12 (6) | 52 (18) |
2+ | 169 (38) | 1 (0) | 4 (1) |
Missing | 3 (1) | 3 (1) | 4 (1) |
Smoking status | |||
Non-smoker | 118 (26) | 167 (82) | 222 (77) |
Smoker | 330 (74) | 36 (18) | 65 (23) |
Maternal Education | |||
Left school at age ≤17 | 187 (42) | 0 (0) | 87 (30) |
Left school at age ≥18 | 44 (10) | 6 (3) | 77 (27) |
Post school training | 162 (36) | 18 (9) | 90 (31) |
University degree | 7 (1) | 157 (77) | 0 (0) |
Other or unknown | 48 (11) | 22 (11) | 33 (12) |
Time from last menstrual bleeding to interview and blood sampling (weeks) | |||
01-20 | 141 (31) | 1 (0) | 112 (39) |
21-30 | 151 (34) | 35 (17) | 61 (21) |
31-42 | 128 (29) | 152 (75) | 89 (31) |
Missing | 28 (6) | 15 (7) | 25 (9) |