Table 4

Calculated number of cases attributable to the off-hours effect per subgroup and in total in the years 2003 through 2007
Models with only social-biological factors Models with social-biological factors, characteristics of the delivery and obstetric interventions performed
Subgroups Number of infants with adverse perinatal outcome Number of infants with adverse perinatal outcome
Referral Induction/ augementation Mode of deliverya Observed Expected with elimination of off-hours effect Attributable to off-hours effect PARa(in %) Observed Expected with elimination of off-hours effect Attributable to off-hours effect PARa(in %)
Intrapartum and early neonatal mortality
Antepartum No Spont. / instr. 187 188 −1 −0.4 187 186 1 0.3
Antepartum No Emergency CS 88 60 28 32.2 88 60 28 32.3
Antepartum Yes All modes 298 237 61 20.5 297 230 67 22.5
Intrapartum No Spont. / instr. 112 108 4 3.2 112 109 3 2.5
Intrapartum No Emergency CS 53 40 13 25.1 53 43 10 18.2
Intrapartum Yes All modes 86 88 −2 −2.9 86 91 −5 −6.2
Total 824 721 103 12.5 823 720 103 12.5
Apgar score 0-6
Antepartum No All modes 1525 1466 59 3.9 1520 1432 88 5.8
Antepartum Yes Spontaneous 1030 844 186 18.0 1027 888 139 13.5
Antepartum Yes Instrumental 698 569 129 18.5 697 573 124 17.8
Antepartum Yes Emergency CS 776 734 42 5.4 776 717 59 7.6
Intrapartum No Spont. / instr. 688 689 −1 −0.1 688 684 4 0.5
Intrapartum No Emergency CS 249 210 39 15.7 249 216 33 13.4
Intrapartum Yes All modes 791 698 93 11.8 790 721 69 8.8
Total 5757 5209 548 9.5 5747 5230 517 9.0
Adverse perinatal outcome (composite measure)
Antepartum No All modes 5919 5892 27 0.4 5903 5844 59 1.0
Antepartum Yes Spontaneous 3078 2746 332 10.8 3065 2783 282 9.2
Antepartum Yes Instrumental 1394 1251 143 10.3 1387 1264 123 8.9
Antepartum Yes Emergency CS 1553 1519 34 2.2 1553 1508 45 2.9
Intrapartum No Spont. / instr. 1762 1733 29 1.7 1757 1712 45 2.6
Intrapartum No Emergency CS 420 383 37 8.8 420 395 25 5.9
Intrapartum Yes All modes 1465 1362 103 7.0 1464 1414 50 3.4
Total 15591 14887 704 4.5 15549 14919 630 4.0

a abbreviations: spont. = spontaneous, intr. = instrumental, CS = caesarean section, PAR = population attributable risk.

Gijsen et al.

Gijsen et al. BMC Pregnancy and Childbirth 2012 12:92   doi:10.1186/1471-2393-12-92

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