| EMERGENCY | |||||
---|---|---|---|---|---|---|
 | 1980-81 | 1990-91 | 1999-2000 | |||
 | Maternal factors | Model SC+AD | Maternal factors | Model SC+AD | Maternal factors | Model SC+AD |
Maternal age | Â | Â | Â | Â | Â | Â |
<20 | 1 | 1 | 1 | 1 | 1 | 1 |
20-24 | 1.37 (1.25-1.51) | 1.39 (1.27-1.53) | 1.44 (1.30-1.59) | 1.45 (1.31-1.60) | 1.61 (1.44-1.79) | 1.61 (1.45-1.80) |
25-29 | 1.74 (1.58-1.92) | 1.80 (1.63-1.99) | 1.89 (1.71-2.09) | 1.93 (1.75-2.13) | 2.36 (2.12-2.62) | 2.38 (2.13-2.65) |
30-34 | 2.31 (2.07-2.57) | 2.42 (2.17-2.71) | 2.44 (2.19-2.71) | 2.52 (2.26-2.81) | 3.11 (2.80-3.47) | 3.14 (2.81-3.51) |
35-39 | 3.56 (3.08-4.10) | 3.74 (3.23-4.32) | 3.30 (2.91-3.75) | 3.43 (3.02-3.91) | 4.19 (3.72-4.72) | 4.23 (3.74-4.78) |
≥40 | 5.91 (4.69-7.44) | 6.18 (4.90-7.79) | 5.00 (4.04-6.19) | 5.22 (4.21-6.47) | 4.84 (4.01-5.83) | 4.88 (4.04-5.91) |
Maternal height | Â | Â | Â | Â | Â | Â |
<155 cm | 1 | 1 | 1 | 1 | 1 | 1 |
155 cm-164 cm | 0.50 (0.47-0.53) | 0.51 (0.48-0.54) | 0.57 (0.54-0.61) | 0.58 (0.54-0.61) | 0.64 (0.59-0.69) | 0.64 (0.60-0.69) |
>164 cm | 0.30 (0.28-0.33) | 0.31 (0.29-0.33) | 0.36 (0.34-0.39) | 0.37 (0.34-0.40) | 0.43 (0.39-0.46) | 0.43 (0.40-0.46) |
Parity | Â | Â | Â | Â | Â | Â |
0 | 1 | 1 | 1 | 1 | 1 | 1 |
1 | 0.39 (0.37-0.42) | 0.39 (0.36-0.41) | 0.35 (0.33-0.37) | 0.34 (0.33-0.36) | 0.33 (0.31-0.35) | 0.33 (0.31-0.35) |
2 | 0.26 (0.23-0.28) | 0.25 (0.23-0.28) | 0.21 (0.19-0.23) | 0.21 (0.19-0.23) | 0.20 (0.18-0.22) | 0.20 (0.18-0.22) |
3+ | 0.23 (0.20-0.26) | 0.22 (0.19-0.25) | 0.18 (0.16-0.21) | 0.18 (0.16-0.21) | 0.21 (0.19-0.24) | 0.21 (0.18-0.24) |
Marital status | Â | Â | Â | Â | Â | Â |
Married | 1 | 1 | 1 | 1 | 1 | 1 |
Single | 0.94 (0.85-1.04) | 0.91 (0.83-1.01) | 0.88 (0.82-0.93) | 0.85 (0.80-0.91) | 1.06 (1.00-1.13) | 1.06 (1.00-1.13) |
Other | 1.29 (1.12-1.48) | 1.26 (1.09-1.44) | 1.03 (0.94-1.14) | 1.01 (0.92-1.11) | 1.11 (1.03-1.19) | 1.10 (1.03-1.18) |
Gestational age | Â | Â | Â | Â | Â | Â |
<37 wks | 1 | 1 | 1 | 1 | 1 | 1 |
37 wks-40 wks | 0.56 (0.51-0.62) | 0.56 (0.51-0.62) | 0.28 (0.26-0.30) | 0.28 (0.26-0.30) | 0.30 (0.28-0.33) | 0.30 (0.28-0.33) |
>40 wks | 0.74 (0.66-0.82) | 0.74 (0.67-0.83) | 0.43 (0.40-0.47) | 0.44 (0.40-0.47) | 0.48 (0.44-0.52) | 0.48 (0.44-0.52) |
 | ELECTIVE | |||||
 | 1980-81 | 1990-91 | 1999-2000 | |||
 | Maternal factors | Model SC+AD | Maternal factors | Model SC+AD | Maternal factors | Model SC+AD |
Maternal age | Â | Â | Â | Â | Â | Â |
<20 | 1 | 1 | 1 | 1 | 1 | 1 |
20-24 | 1.78 (1.48-2.14) | 1.78 (1.49-2.14) | 1.37 (1.08-1.74) | 1.37 (1.08-1.74) | 1.88 (1.39-2.54) | 1.85 (1.37-2.50) |
25-29 | 2.40 (1.99-2.88) | 2.42 (2.01-2.91) | 2.07 (1.64-2.62) | 2.08 (1.64-2.63) | 2.77 (2.07-3.71) | 2.68 (2.00-3.60) |
30-34 | 3.51 (2.90-4.24) | 3.55 (2.92-4.31) | 2.72 (2.14-3.45) | 2.74 (2.16-3.48) | 3.63 (2.71-4.87) | 3.46 (2.58-4.66) |
35-39 | 6.09 (4.93-7.51) | 6.17 (4.99-7.62) | 3.78 (2.94-4.85) | 3.81 (2.96-4.91) | 4.96 (3.68-6.68) | 4.67 (3.46-6.32) |
≥40 | 10.2 (7.76-13.4) | 10.32 (7.86-13.6) | 5.52 (4.05-7.52) | 5.57 (4.08-7.61) | 6.37 (4.56-8.88) | 5.99 (4.28-8.37) |
Maternal height | Â | Â | Â | Â | Â | Â |
<155 cm | 1 | 1 | 1 | 1 | 1 | 1 |
155 cm-164 cm | 0.45 (0.42-0.48) | 0.45 (0.42-0.49) | 0.43 (0.40-0.47) | 0.43 (0.40-0.47) | 0.57 (0.51-0.63) | 0.56 (0.51-0.62) |
>164 cm | 0.31 (0.28-0.34) | 0.31 (0.28-0.34) | 0.28 (0.25-0.31) | 0.28 (0.25-0.31) | 0.42 (0.38-0.46) | 0.41 (0.37-0.45) |
Parity | Â | Â | Â | Â | Â | Â |
0 | 1 | 1 | 1 | 1 | 1 | 1 |
1 | 1.91 (1.76-2.08) | 1.91 (1.75-2.08) | 4.25 (3.85-4.68) | 4.24 (3.84-4.67) | 4.25 (3.84-4.71) | 4.30 (3.88-4.76) |
2 | 1.56 (1.41-1.73) | 1.55 (1.40-1.72) | 4.21 (3.77-4.70) | 4.20 (3.76-4.70) | 4.26 (3.80-4.79) | 4.35 (3.87-4.90) |
3+ | 0.90 (0.78-1.03) | 0.89 (0.77-1.02) | 2.19 (1.88-2.54) | 2.17 (1.87-2.53) | 2.83 (2.44-3.27) | 2.94 (2.53-3.41) |
Marital status | Â | Â | Â | Â | Â | Â |
Married | 1 | 1 | 1 | 1 | 1 | 1 |
Single | 0.78 (0.65-0.94) | 0.78 (0.65-0.94) | 0.77 (0.69-0.86) | 0.77 (0.68-0.86) | 0.71 (0.65-0.79) | 0.74 (0.67-0.82) |
Other | 0.99 (0.82-1.19) | 0.99 (0.82-1.19) | 0.88 (0.78-1.00) | 0.88 (0.77-1.00) | 0.92 (0.83-1.01) | 0.94 (0.85-1.03) |
Gestational age | Â | Â | Â | Â | Â | Â |
<37 wks | 1 | 1 | 1 | 1 | 1 | 1 |
37 wks-40 wks | 0.38 (0.34-0.42) | 0.38 (0.34-0.42) | 0.68 (0.60-0.77) | 0.68 (0.60-0.77) | 1.10 (0.95-1.27) | 1.09 (0.94-1.26) |
>40 wks | 0.14 (0.12-0.16) | 0.14 (0.12-0.16) | 0.13 (0.11-0.16) | 0.13 (0.11-0.16) | 0.17 (0.14-0.21) | 0.17 (0.14-0.21) |