Table 1.
Numbers of late and moderately preterm (LMPT) and term births and rates and univariable relative risk of LMPT birth by maternal lifestyle characteristics
| Indicator | LMPT births | Term-born births | Rate of LMPT births/ 100 births weighted* | Relative risk of LMPT birth | 95% CI | P value |
|---|---|---|---|---|---|---|
| Use of recreational drugs during pregnancy | ||||||
| No | 903 | 956 | 5.9 | 1 | – | 0.156 |
| Yes | 19 | 12 | 9.6 | 1.61 | 0.83 to 3.13 | |
| Smoking status | ||||||
| Non-smoker | 524 | 572 | 5.8 | 1 | – | 0.001 |
| Gave-up before pregnancy | 145 | 196 | 4.7 | 0.82 | 0.65 to 1.03 | |
| Gave-up in 1st trimester | 57 | 57 | 6.3 | 1.09 | 0.76 to 1.56 | |
| Smoker during pregnancy | 196 | 143 | 8.4 | 1.46 | 1.16 to 1.83 | |
| Alcohol use | ||||||
| Non-drinker | 289 | 255 | 7.0 | 1 | – | 0.087 |
| Gave up before pregnancy | 267 | 298 | 5.6 | 0.80 | 0.64 to 1.00 | |
| Gave up in first trimester | 201 | 241 | 5.3 | 0.75 | 0.59 to 0.95 | |
| Drank during pregnancy | 165 | 174 | 6.0 | 0.85 | 0.66 to 1.09 | |
| Daily consumption of five fruit and vegetables | ||||||
| At least once a week | 728 | 819 | 5.6 | 1 | – | 0.001 |
| Never | 194 | 149 | 8.0 | 1.43 | 1.15 to 1.78 | |
| Mediterranean diet factors | ||||||
| ≥1 | 889 | 951 | 5.9 | 1 | – | 0.013 |
| None | 33 | 17 | 11.5 | 1.96 | 1.15 to 3.32 | |
*Rate of LMPT birth calculated using weight of 15 for term births.