Table 1.
Demographic characteristics according to age group (years)
| 13–15 | 16–17 | 18–19 | All teenagers | 25–29 | p Value* for difference | |
|---|---|---|---|---|---|---|
| N | 84 | 1234 | 5987 | 7305 | 51 142 | |
| Cohabitation status | ||||||
| Married/cohabiting | 13 (15.5) | 598 (48.5) | 4248 (71.0) | 4859 (66.5) | 45 262 (88.5) | <0.001 |
| Single | 45 (53.6) | 471 (38.2) | 1132 (18.9) | 1644 (22.5) | 2608 (5.1) | |
| Missing data | 26 (30.9) | 165 (13.3) | 607 (10.1) | 802 (11.0) | 3272 (6.4) | |
| Type of residence | ||||||
| Urban | 52 (61.9) | 820 (66.5) | 3980 (66.5) | 4852 (66.4) | 37 589 (73.5) | <0.001 |
| Densely populated | 14 (16.7) | 185 (15.0) | 1050 (17.5) | 1249 (17.1) | 7313 (14.3) | |
| Rural | 16 (19.0) | 222 (18.0) | 930 (15.5) | 1168 (16.0) | 6035 (11.8) | |
| Missing data | 2 (2.4) | 7 (0.5) | 27 (0.5) | 36 (0.5) | 205 (0.4) | |
| Smoking during pregnancy | ||||||
| Yes | 28 (33.3) | 506 (41.3) | 2127 (35.5) | 2661 (36.4) | 3580 (7.0) | <0.001 |
| Quit during first trimester | 11 (13.1) | 157 (12.7) | 725 (12.1) | 893 (12.2) | 3324 (6.5) | |
| Missing data | 6 (7.1) | 37 (3.0) | 171 (2.9) | 214 (2.9) | 921 (1.8) | |
| Alcohol or drug misuse during pregnancy | 3 (3.6) | 14 (1.1) | 65 (1.1) | 82 (1.1) | 96 (0.2) | <0.001 |
| BMI before pregnancy | ||||||
| Underweight† | 16 (19.0) | 155 (12.6) | 57 (9.6) | 228 (10.3) | 1841 (3.6) | <0.001 |
| Obese‡ | 109 (1.3) | 63 (5.1) | 395 (6.6) | 567 (6.3) | 4347 (8.5) | |
| Missing data | 6 (7.1) | 57 (4.6) | 174 (2.9) | 237 (3.2) | 1074 (2.1) | |
| History of spontaneous abortion(s) | 2 (2.4) | 51 (4.1) | 479 (8.0) | 532 (7.3) | 5984 (11.7) | <0.001 |
| Pre-existing hypertension | 0 (0) | 1 (0.1) | 6 (0.1) | 7 (0.1) | 102 (0.2) | 0.026 |
| Pre-existing diabetes | 0 (0) | 7 (0.6) | 42 (0.7) | 49 (0.7) | 358 (0.7) | 0.834 |
Data expressed as n (%).
*p Values refer to differences between all the age groups.
†BMI <18.5 kg/m2.
‡BMI≥30 kg/m2.
BMI, body mass index.