Table 3.
Variables adjusted for in regression models in studies included in the meta-analysis of adjusted odds ratios.
| Study ID | Number of data points | Restricted to primiparas | Restricted to singletons | Variables adjusted for in regression model |
|---|---|---|---|---|
| Fayed 2018 | 1 | No | Yes | BMI, parity, gestational age, smoke exposure, hypertension, diabetes |
| Haldre 2007 | 2 | Yes | Yes | Ethnicity, marital status, place of residence, calendar year, adequacy of prenatal care, smoking |
| Jolly 2000 | 1 | No | Yes | Ethnicity, parity, BMI, hypertension, diabetes, preclampsia, smoking |
| Kawakita 2016 | 2 | Yes | Yes | Ethnicity, marital status, insurance type, substance abuse, BMI, hospital type, gestational age, diabetes, hypertension |
| Leppalahti 2013 | 3 | Yes | Yes | Cohabitation status, type of residence, smoking, adequacy of prenatal care, alcohol or drug misuse, BMI, diabetes, hypertension, placental abruption, chorioamnionitis, pre-eclampsia, eclampsia, anaemia, history of spontaneous abortions |
| Marvin-Dowle 2018 | 1 | Yes | Yes | Index of multiple deprivation score, ethnicity |
| Mohsin 2006 | 2 | |||
| Model 1 | 1 | No | No | Infant sex, maternal age, country of birth, smoking behaviour during pregnancy, parity, maternal hypertension, birth weight, gestational age |
| Model 2 | 1 | No | No | Infant sex, maternal age, country of birth, smoking behaviour during pregnancy, parity, maternal hypertension, birth weight |
| O'Leary 2007 | 2 | No | No | Birth year, parity, marital status, race, multiple bith, socio-economic disadvantage, region |
| Otterblad-Olausson 1999 | 3 | Yes | Yes | Education, birth year |
| Smith 2001 | 1 | Yes | Yes | Maternal height category, deprivation, previous spontaneous and theraputic abortions, year |