Table 3.
Age-standardised Rates of CS for 10-group classification and Hospital Groupings, NSW, 1998-2008
| Groupings | Caesarean Rate in each group (%) |
Contribution made by each group to overall CS rate % (denom = 965,702) |
ASR (per 100 deliveries) of contribution made to overall CS rate |
APC (95% Upper and Lower CL) in ASR (%) |
|---|---|---|---|---|
| 10-Group Classification | ||||
| Nulliparous, single vertex, ≥37 wk, spontaneous labour -1 | 29,961/225,216 (13.3) | 3.1 | 2.9 | 3.5 (1.8; 5.2)* |
| Nulliparous, single vertex, ≥37 wk, Induced or CS wi No Labour-2 | 50,421/127,004 (39.7) | 5.2 | 4.9 | 6.8 (5.5; 8.2)* |
| Multiparous (excl prev CS), single vertex, ≥37 wk spontaneous labour -3 | 6,146/280,506 (2.2) | 0.6 | 0.6 | 1.1 (-1.3; 3.6) |
| Multiparous (excl prev CS), single vertex, ≥37 wk, Induced or CS wi No labour -4 | 17,736/121,911 (14.6) | 1.8 | 1.8 | 4.0 (1.9; 6.2)* |
| Previous CS, single vertex, ≥37 wk -5 | 79,480/104,160 (76.3) | 8.2 | 8.4 | 5.3 (4.8; 5.8)* |
| All nulliparous breeches -6 | 17,410/19,294 (90.2) | 1.8 | 1.7 | 0.8 (-0.3; 2.0) |
| All multiparous breeches -7 | 14,775/17,730 (83.3) | 1.5 | 1.5 | -1.0 (-2.8; 0.7) |
| All multiple pregnancies -8 | 8,651/15,163 (57.0) | 0.9 | 1.8 | 3.6 (1.3; 5.9)* |
| All 'other' lies -9 | 5,430/6,979 (77.8) | 0.6 | 0.6 | -2.8 (-4.6; -1.1)* |
| All single vertex, ≤ 36 wk -10 | 14,159/46,734 (30.3) | 1.5 | 1.4 | 4.0 (3.6; 4.4)* |
*Indicates significant at p < 0.05 level
Abbreviations: ASR = age-standardised rate; APC = annual percentage change