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Rise in “no indicated risk” primary caesareans in the United States, 1991-2001: cross sectional analysis

BMJ 2005; 330 doi: https://doi.org/10.1136/bmj.38279.705336.0B (Published 06 January 2005) Cite this as: BMJ 2005;330:71

Data supplement

  • Definitions

    Table


    Definitions

    Medical risk factors

    Anaemia, cardiac disease, acute or chronic lung disease, diabetes, genital herpes, hydramnios/oligohydramnios, haemoglobinopathy, chronic hypertension, pregnancy associated hypertension, eclampsia, incompetent cervix, previous infant ³ 4000 g, previous preterm or small for gestational age infant, renal disease, Rh sensitisation, uterine bleeding.

    Complications of labour or delivery

    Febrile, meconium moderate/heavy, premature rupture of membrane, abruptio placenta, placenta previa, other excessive bleeding, seizures during labour, precipitous labour, prolonged labour, dysfunctional labour, breech/malpresentation, cephalopelvic disproportion, cord prolapse, anaesthetic complication, fetal distress.


    Table    : Adjusted odds ratios (95% confidence intervals) for primary caesarean delivery for mothers with no indicated risk factors†: United States, 1991, 1996, and 2001

     

    All mothers

    First time mothers

    Year

    2001

    1.49** (1.47 to 1.50)

    1.46** (1.44 to 1.48)

    1996

    0.99 (0.98 to 1.00)

    0.99 (0.97 to 1.00)

    1991

    1.00

    1.00

    Race/ethnicity

    White non-Hispanic

    1.00

    1.00

    Hispanic

    1.54** (1.52 to 1.55)

    1.65** (1.63 to 1.68)

    Black non-Hispanic

    1.79** (1.76 to 1.81)

    1.80** (1.77 to 1.84)

    Native American

    0.98 (0.92 to 1.03)

    1.08* (1.00 to 1.17)

    Asian or Pacific Islander

    1.12** (1.10 to1.14)

    1.10** (1.07 to 1.13)

    Age

    20-24

    1.00

    1.00

    25-29

    1.47** (1.45 to 1.49)

    1.65** (1.62 to 1.67)

    30-34

    1.91** (1.88 to 1.93)

    2.30** (2.26 to 2.34)

    35-39

    2.62** (2.58 to 2.66)

    3.58** (3.49 to 3.66)

    ³40

    3.85** (3.74 to 3.96)

    5.42** (5.16 to 5.70)

    Education (years)

    <12 years

    1.00

    1.00

    12 years

    1.22** (1.21 to 1.24)

    1.21** (1.19 to 1.23)

    ³13 years

    1.15** (1.14 to 1.17)

    1.08** (1.06 to 1.10)

    Birth weight (g)

    <2500

    1.63** (1.59 to 1.67)

    1.40** (1.36 to 1.45)

    2500-3999

    1.00

    1.00

    ³4000

    2.23** (2.21 to 2.26)

    2.76** (2.72 to 2.81)

    Parity

    1

    1.00

    –

    ³2

    0.27** (0.27 to 0.28)

    –

    Source: Natality Data Sets: 1991, 1996, 2001. National Center for Health Statistics.

    †Full term, singleton, vertex births with no medical risk factors or complications of labour or delivery reportedon the birth certificate.

    *P<0.05.

    **P<0.0001.




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