Characteristic*
Missing N Total (n = 694) Total (n = 694) Calcium intake <750 mg/day (n = 201) Calcium intake <750 mg/day (n = 201) Calcium intake >750 mg/day (n = 493) Calcium intake >750 mg/day (n = 493)
P
Age at conception 142 32.8 ± 4.37 32.3 ± 4.52 33.0 ± 4.37 .095
Education 158
Higher 336 (62.7) 90 (56.6) 246 (65.3) .147
Middle 163 (30.4) 55 (34.6) 108 (28.6)
Lower 37 (6.9) 14 (8.8) 23 (6.1)
Ethnicity 171
Dutch 453 (86.6) 126 (82.9) 327 (88.1) .053
Non-Dutch Western 28 (5.4) 7 (4.6) 21 (5.7)
Non-Western 42 (8.0) 19 (12.5) 23 (6.2)
Periconceptional:
BMI 0 24.1 ± 3.98 24.0 ± 3.88 24.1 ± 4.02 .613
Daily caloric intake (kCal) 0 2127 ± 531 1902 ± 328 2219 ± 569 <.001
Diet 153 47 (8.7) 13 (8.1) 34 (8.9) .072
Vegetarian 22 (4.1) 3 (1.9) 19 (5.0)
Vegan 2 (0.4) 2 (1.3) 0 (0.0)
Macrobiotic 1 (0.2) 0 (0.0) 1 (0.3)
Other 22 (4.1) 8 (5.0) 14 (3.7)
Calcium intake 694
>1000 mg/day 278 (40.1) - - -
>750 mg/day 493 (71.0) - - -
>500 mg/day 658 (94.8) - - -