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Table 4 Odds Ratios (95% CI) for maternal factors related to emergency and elective Caesarean sections, Scotland 1980-2000

From: The influence of both individual and area based socioeconomic status on temporal trends in Caesarean sections in Scotland 1980-2000

  EMERGENCY
  1980-81 1990-91 1999-2000
  Maternal factors Model SC+AD Maternal factors Model SC+AD Maternal factors Model SC+AD
Maternal age       
<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       
<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       
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       
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       
<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       
<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       
<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       
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       
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       
<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)
  1. Maternal factors - adjusts for maternal age, maternal height, parity, gestational age and marital status, only
  2. Model SC+AD - additionally adjusts for both social class and area deprivation