Table 1 Characteristics of the cohort of women who redeemed, and who did not redeem a nitrosatable prescription drug during the first 22 weeks of pregnancy, 1997–2017, Denmark
Characteristic | Redeemed nitrosatable drug during the first 22 weeks of pregnancy | |
|---|---|---|
No (n = 552,566) | Yes (n = 100,244) | |
Age, y, n (%) | ||
< 19 | 5706 (1.0) | 1266 (1.3) |
19–24 | 66,476 (12.0) | 14,666 (14.6) |
24–29 | 193,577 (35.0) | 34,355 (34.3) |
29–34 | 189,329 (34.3) | 32,348 (32.3) |
> 34 | 96,972 (17.5) | 17,541 (17.5) |
Missing | 506 (0.0) | 68 (0.0) |
Body mass index, kg/m2, n (%) | ||
< 18 | 14,607 (2.6) | 2336 (2.3) |
18–25 | 192,003 (34.7) | 27,979 (27.9) |
25–30 | 55,658 (10.1) | 10,271 (10.2) |
> 30 | 29,124 (5.3) | 7361 (7.3) |
Missing | 261,174 (47.3) | 52,297 (52.2) |
Parity, n (%) | ||
Nulliparous | 422,921 (76.5) | 68,909 (68.7) |
Primiparous | 76,403 (13.8) | 17,930 (17.9) |
Multiparous | 43,918 (7.9) | 11,570 (11.5) |
Missing | 9324 (1.7) | 1835 (1.8) |
Smoking during pregnancy, n (%) | ||
No | 401,154 (72.6) | 66,726 (66.6) |
Yes | 82,775 (15.0) | 19,259 (19.2) |
Missing | 68,637 (12.4) | 14,259 (14.2) |
Maternal level of education, n (%) | ||
Higher education or PhD | 58,747 (10.6) | 6820 (6.8) |
Middle education | 124,762 (22.6) | 18,744 (18.7) |
Basic education | 37,321 (6.8) | 5834 (5.8) |
High School or vocational | 213,658 (38.7) | 40,075 (40.0) |
Primary school | 101,265 (18.3) | 26,277 (26.2) |
Unknown | 13,584 (2.5) | 2171 (2.2) |
Missing | 3229 (0.6) | 323 (0.3) |
Maternal occupation, n (%) | ||
Owner of business | 10,267 (1.9) | 1606 (1.6) |
Chief executive or employee with high income | 70,443 (12.7) | 9270 (9.2) |
Employee with middle income | 106,673 (19.3) | 16,453 (16.4) |
Employee with low income | 153,572 (27.8) | 30,148 (30.1) |
Employee unspecified income | 81,095 (14.7) | 14,403 (14.4) |
Pensioners | 2301 (0.4) | 1087 (1.1) |
Unemployed | 127,184 (23.0) | 27,231 (27.2) |
Missing | 1031 (0.2) | 46 (0.0) |
Urbanicity of maternal address at birth, n (%) | ||
Rural areasa | 130,413 (23.6) | 26,497 (26.4) |
Provincial townb | 143,405 (26.0) | 28,956 (28.9) |
Provincial cityc | 84,114 (15.2) | 13,289 (13.3) |
Suburb of capital | 63,944 (11.6) | 12,403 (12.4) |
Capital | 121,507 (22.0) | 18,205 (18.2) |
Missing | 9183 (1.7) | 894 (0.9) |
Household NO3− average concentration (mg/L), n (%) | ||
≤ 1 | 128,213 (23.2) | 23,836 (23.8) |
> 1- ≤ 2 | 170,870 (30.9) | 28,624 (28.6) |
> 2- ≤ 5 | 181,868 (32.9) | 33,501 (33.4) |
> 5- ≤ 25 | 52,634 (9.5) | 10,827 (10.8) |
> 25 | 18,981 (3.4) | 3456 (3.4) |