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Table 2 Adjusted odds ratios (aORs) of planned and non-planned caesarean section (CS) births according to parity during 2000–2010 in Finland, using women with vaginal birth as a reference group in all analyses (logistic regression analysis)

From: Influence of delivery characteristics and socioeconomic status on giving birth by caesarean section – a cross sectional study during 2000–2010 in Finland

Characteristic

Nulliparous women

Multiparous women

 

Planned CS, n = 14,514

Non-planned CS, n = 33,873

Planned CS, n = 26,132

Non-planned CS, n = 19,555

 

aOR (95% CI)

aOR (95% CI)

aOR (95% CI)

aOR (95% CI)

Maternal age (years)

    

< 20

1

1

1

1

20-29

1.35 (1.23-1.49)

1.56 (1.46-1.67)

1.34 (0.97-1.85)

1.08 (0.81-1.44)

30-39

2.39 (2.17-2.64)

2.54 (2.37-2.72)

1.94 (1.40-2.69)

1.37 (1.03-1.83)

40 or more

4.85 (4.23-5.55)

4.14 (3.75-4.58)

2.74 (1.97-3.81)

1.83 (1.36-2.46)

Birth weight (g)

    

<3000

1.56 (1.48-1.64)

1.69 (1.64-1.75)

1.49 (1.42-1.57)

3.49 (3.33-3.65)

3000-3499

1.20 (1.15-1.26)

1

1.30 (1.26-1.35)

1.09 (1.05-1.14)

3500-3999

1

1.27 (1.23-1.31)

1

1

4000 or more

1.47 (1.39-1.56)

2.24 (2.16-2.33)

1.13 (1.06-1.21)

1.46 (1.40-1.52)

Male fetal sex

0.94 (0.91-0.98)

1.20 (1.67-1.22)

1.04 (1.01-1.07)

1.20 (1.17-1.24)

Smoking status

    

Non-smoking

1

1

1

1

Quit smoking during 1st trimester

1.06 (0.98-1.13)

1.07 (1.01-1.13)

1.07 (0.97-1.18)

1.18 (1.07-1.31)

Smoking after 1st trimester

0.94 (0.89-1.00)

1.10 (1.06-1.15)

1.01 (0.96-1.06)

1.00 (0.95-1.06)

Missing information

1.36 (1.21-1.52)

1.15 (1.06-1.25)

1.41 (1.30-1.53)

1.17 (1.07-1.28)

Single (ref married/living with a partner)

0.93 (0.87-0.99)

0.99 (0.95-1.03)

1.02 (0.95-1.10)

1.12 (1.04-1.20)

Socioeconomic status

    

Upper white collar workers

1

1

1

1

Lower white collar workers

1.09 (1.02-1.16)

1.05 (1.00-1.10)

1.17 (1.11-1.24)

1.07 (1.00-1.11)

Blue collar workers

1.03 (0.95-1.11)

1.07 (1.01-1.13)

1.16 (1.09-1.24)

1.15 (1.07-1.23)

Othersa

0.95 (0.89-1.02)

0.93 (0.88-0.97)

0.98 (0.92-1.04)

0.92 (0.87-0.98)

Missing information

0.96 (0.89-1.03)

1.01 (0.96-1.06)

1.13 (1.06-1.21)

1.08 (1.01-1.15)

Induction

NA

1.64 (1.59-1.68)

NA

0.97 (0.94-1.01)

Preeclampsia

6.41 (5.53-7.44)

11.77 (10.62-13.04)

1.04 (0.96-1.14)

2.12 (1.95-2.30)

Gestational diabetes

0.55 (0.49-0.62)

1.34 (1.26-1.43)

1.07 (1.01-1.15)

1.39 (1.30-1.48)

Maternal diabetes mellitus

3.95 (3.51-4.46)

1.14 (1.06-1.23)

1.66 (1.54-1.78)

1.06 (0.98-1.15)

Fear of childbirth

7.99 (7.53-8.48)

1.58 (1.48-1.70)

5.05 (4.83-5.28)

1.67 (1.58-1.78)

Placental abruption

NA

29.42 (24.22-35.74)

NA

61.78 (52.87-72.20)

Placenta previa

25.35 (20.56-31.25)

8.05 (6.46-10.04)

39.65 (32.73-48.04)

22.41 (18.46-27.20)

In vitro fertilization (IVF)

1.25 (1.13-1.38)

1.25 (1.16-1.34)

1.49 (1.30-1.72)

1.86 (1.63-2.12)

Prior terminations

1.02 (0.97-1.08)

1.09 (1.05-1.13)

1.10 (1.05-1.15)

1.10 (1.05-1.15)

Prior miscarriages

1.16 (1.10-1.22)

1.12 (1.08-1.16)

0.99 (0.96-1.03)

1.00 (0.96-1.03)

Prior caesarean section

NA

NA

20.60 (19.97-21.24)

8.32 (8.06-8.60)

Time period

    

2000-2003

1.40 (1.34-1.47)

0.94 (0.92-0.97)

1.55 (1.49-1.61)

1.02(0.98-1.06)

2004-2007

1.21 (1.16-1.27)

0.95 (0.92-0.98)

1.22 (1.18-1.27)

1.03 (0.99-1.07)

2008-2010

1

1

1

1

  1. aOthers comprised entrepreneurs, students, retired women, unemployed women, housewives and all unclassifiable cases, NA = not applicable.