Maternal characteristics of 2009–2010 California births (n (%)), stratified by weekday/weekend and daily volume
| Weekday | Weekend | ||||
|---|---|---|---|---|---|
| Maternal characteristic | Overall (N=724 967) | Low/average-volume day (N=345 097) | High-volume day (N=202 647) | Low/average-volume day (N=153 287) | High-volume day (N=23 946) |
| Race/ethnicity* | |||||
| White | 224 897 (31.0) | 108 553 (31.5) | 63 392 (31.3) | 45 844 (29.9) | 7108 (29.7) |
| Black | 38 083 (5.3) | 18 472 (5.4) | 9984 (4.9) | 8250 (5.4) | 1377 (5.8) |
| Hispanic | 343 920 (47.5) | 161 867 (46.9) | 97 226 (48.0) | 73 505 (48.0) | 11 322 (47.3) |
| Asian-American | 90 871 (12.5) | 43 286 (12.6) | 24 594 (12.1) | 19 861 (13.0) | 3130 (13.1) |
| Other | 27 045 (3.7) | 12 848 (3.7) | 7389 (3.7) | 5803 (3.8) | 1005 (4.2) |
| Maternal age ≥35 years | 114 337 (15.8) | 55 549 (16.1) | 31 795 (15.7) | 23 300 (15.2) | 3693 (15.4) |
| Education ≥12 years† | 342 424 (49.1) | 164 419 (49.6) | 95 367 (49.0) | 71 553 (48.6) | 11 085 (47.9) |
| Nulliparous‡ | 335 755 (46.4) | 158 650 (46.0) | 93 179 (46.0) | 72 642 (47.4) | 11 284 (47.2) |
| Public insurance§ | 375 694 (51.8) | 177 401 (51.4) | 106 030 (52.3) | 80 293 (52.4) | 11 970 (50.0) |
| Prenatal care initiation first trimester¶ | 590 568 (83.1) | 281 531 (83.2) | 165 582 (83.2) | 124 518 (83.0) | 18 937 (81.3) |
*151 missing for race/ethnicity.
†28 123 missing for educational status.
‡609 missing for parity.
§13 missing for insurance status.
¶14 116 missing for prenatal care utilisation.