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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)