Relation between postmenstrual age at discharge, characteristics of the infant, and region of care
| Coefficient (PMAD in weeks) | SE | 95% CI | p Value | |
|---|---|---|---|---|
| The adjusted postmenstrual age at discharge (PMAD) is shown together with the 95% confidence interval (CI). All coefficients are adjusted for the clustered nature of the data (n = 4216; 143 patients with missing covariates were excluded). | ||||
| Constant | 32.93 | 1.05 | (30.87 to 35.00) | <0.001 |
| Region of care | ||||
| California | −0.56 | 0.19 | (−0.93 to −0.19) | 0.003 |
| Massachusetts | −0.13 | 0.15 | (−0.43 to 0.17) | 0.385 |
| United Kingdom | 0 | |||
| Mother received antenatal steroids | ||||
| Yes | −0.005 | 0.05 | (−0.10 to 0.09) | 0.920 |
| No | 0 | |||
| Infant delivered by caesarean section | ||||
| Yes | 0.07 | 0.05 | (−0.02 to 0.16) | 0.121 |
| No | 0 | |||
| Gestational age at delivery (weeks) | 0.11 | 0.03 | (0.06 to 0.16) | <0.001 |
| Sex of infant | ||||
| Male | 0.15 | 0.05 | (0.05 to 0.24) | 0.003 |
| Female | 0 | |||
| Size for gestation (birthweight z- score) | −0.70 | 0.04 | (−0.78 to −0.62) | <0.001 |
| Apgar score at 5 min | −0.06 | 0.04 | (−0.13 to 0.01) | 0.103 |
| Infant received mechanical ventilation | ||||
| Yes | 0.75 | 0.06 | (0.64 to 0.87) | <0.001 |
| No | 0 | |||