| LMP | SFH | BS | ||||
---|---|---|---|---|---|---|---|
 | ≥37 weeks (term) | <  37 weeks (preterm) | ≥37 weeks (term) | <  37 weeks (preterm) | ≥37 weeks (term) | <  37 weeks (preterm) | |
US | ≥37 weeks (term) | n = 246 | n = 98 | n = 1025 | n = 360 | n = 1001 | n = 307 |
< 37 weeks (preterm) | n = 22 | n = 38 | n = 48 | n = 191 | n = 123 | n = 89 |