Table 2 Crude and adjusted odds ratios of obstetric transfusion in women giving birth in New South Wales hospitals, 2005–2015 (Method 1)
Crude odds ratios (95% CI) | Adjusted odds ratios (95% CI) | ||
|---|---|---|---|
Pre-pregnancy | Full model | ||
Year of birth | |||
2005 | Ref | Ref | Ref |
2006 | 1.09 (0.98,1.21) | 1.08 (0.98,1.20) | 1.09 (0.98,1.21) |
2007 | 1.19 (1.07,1.31) | 1.19 (1.07,1.32) | 1.16 (1.05,1.29) |
2008 | 1.10 (1.00,1.22) | 1.12 (1.01,1.23) | 1.09 (0.98,1.21) |
2009 | 1.24 (1.12,1.36) | 1.27 (1.15,1.40) | 1.26 (1.13,1.39) |
2010 | 1.28 (1.16,1.41) | 1.30 (1.18,1.44) | 1.29 (1.16,1.43) |
2011 | 1.38 (1.25,1.53) | 1.40 (1.27,1.55) | 1.37 (1.24,1.52) |
2012 | 1.30 (1.18,1.44) | 1.29 (1.17,1.43) | 1.26 (1.14,1.39) |
2013 | 1.39 (1.26,1.53) | 1.36 (1.23,1.50) | 1.34 (1.21,1.48) |
2014 | 1.35 (1.22,1.49) | 1.30 (1.17,1.43) | 1.27 (1.14,1.40) |
2015 | 1.39 (1.25,1.56) | 1.34 (1.20,1.50) | 1.29 (1.15,1.45) |
Maternal age | |||
< 20 years | 1.34 (1.23,1.46) | 1.20 (1.10,1.31) | 1.33 (1.22,1.45) |
20–24 years | Ref | Ref | Ref |
25–29 years | 0.83 (0.78,0.87) | 0.93 (0.88,0.98) | 0.86 (0.81,0.91) |
30–34 years | 0.77 (0.73,0.81) | 0.99 (0.93,1.04) | 0.87 (0.82,0.92) |
35–39 years | 0.81 (0.76,0.86) | 1.08 (1.01,1.15) | 0.90 (0.84,0.96) |
40+ years | 1.07 (0.98,1.16) | 1.31 (1.20,1.44) | 1.06 (0.97,1.17) |
Smoke | 1.20 (1.14,1.26) | 1.02 (0.97,1.08) | 1.01 (0.96,1.07) |
Parity | |||
1st | Ref | Ref | Ref |
2nd | 0.60 (0.58,0.63) | 0.54 (0.51,0.56) | 0.77 (0.73,0.81) |
3rd | 0.69 (0.65,0.72) | 0.58 (0.55,0.62) | 0.87 (0.82,0.92) |
4th | 0.86 (0.80,0.93) | 0.67 (0.62,0.72) | 0.98 (0.90,1.07) |
5+ | 1.25 (1.16,1.35) | 0.86 (0.79,0.93) | 1.21 (1.10,1.32) |
Multiple | 3.32 (3.07,3.60) | 2.94 (2.71,3.20) | 2.50 (2.28,2.74) |
Australian born | 0.88 (0.85,0.91) | 0.91 (0.88,0.94) | 0.89 (0.86,0.92) |
Assisted reproductive technology | 1.55 (1.43,1.69) | 1.66 (1.52,1.82) | 1.47 (1.33,1.61) |
Previous obstetric transfusion | 4.66 (4.17,5.20) | 3.00 (2.64,3.42) | 2.73 (2.38,3.13) |
Previous postpartum haemorrhage | 1.98 (1.85,2.12) | 1.88 (1.73,2.04) | 1.82 (1.68,1.98) |
Uterine scar | 0.96 (0.92,1.01) | 1.27 (1.20,1.33) | 1.08 (1.02,1.16) |
Pregestational diabetes | 1.35 (1.11,1.64) | 0.97 (0.79,1.19) | 0.78 (0.63,0.95) |
Pregestational hypertension | 1.54 (1.36,1.75) | 1.22 (1.06,1.39) | 0.99 (0.86,1.13) |
Chronic condition | 2.58 (2.40,2.77) | 1.74 (1.61,1.88) | 1.64 (1.51,1.77) |
Blood disorder | 13.01 (12.31,13.75) | 11.31 (10.68,11.98) | 10.37 (9.76,11.02) |
Morbid obesity | 1.98 (1.69,2.32) | 1.41 (1.20,1.67) | 1.26 (1.07,1.50) |
Private insurance | 0.54 (0.52,0.56) | 0.56 (0.53,0.58) | 0.56 (0.54,0.59) |
Quintile of socioeconomic status | |||
Most disadvantaged quintile | Ref | Ref | Ref |
Second quintile | 0.99 (0.94,1.04) | 1.03 (0.98,1.08) | 1.02 (0.97,1.07) |
Middle quintile | 0.92 (0.87,0.97) | 1.01 (0.95,1.06) | 0.95 (0.90,1.00) |
Fourth quintile | 0.80 (0.76,0.84) | 0.88 (0.83,0.93) | 0.85 (0.80,0.90) |
Most advantaged quintile | 0.63 (0.59,0.66) | 0.75 (0.70,0.79) | 0.72 (0.68,0.77) |
Area of residence unknown | 0.92 (0.79,1.08) | 0.91 (0.78,1.07) | 0.96 (0.81,1.13) |
Pregnancy anaemia | 4.36 (3.77,5.04) | – | 1.20 (1.02,1.42) |
Antepartum haemorrhage | 2.21 (2.05,2.39) | – | 1.22 (1.12,1.32) |
Placenta praevia | 8.02 (7.51,8.56) | – | 6.89 (6.35,7.49) |
Placental abruption | 8.79 (8.03,9.63) | – | 5.60 (5.04,6.22) |
Morbidly adherent placenta | 29.34 (26.84,32.06) | – | 22.08 (19.87,24.53) |
Retained placental tissue | 1.57 (1.30,1.91) | – | 0.88 (0.71,1.09) |
Uterine rupture | 24.35 (19.88,29.83) | – | 18.63 (14.76,23.52) |
Uterine fibroids | 3.94 (3.14,4.95) | – | 3.21 (2.49,4.13) |
Gestational diabetes | 1.15 (1.08,1.23) | – | 0.90 (0.84,0.97) |
Gestational hypertension | 1.96 (1.87,2.06) | – | 1.46 (1.38,1.54) |
Gestational age | |||
20–32 weeks | 4.39 (4.08,4.71) | – | 2.09 (1.91,2.29) |
33–36 weeks | 2.14 (2.03,2.27) | – | 1.28 (1.20,1.37) |
37–41 weeks | Ref | – | Ref |
42+ weeks | 1.58 (1.35,1.85) | – | 1.38 (1.17,1.62) |
Large for gestational age | 1.58 (1.51,1.66) | – | 1.62 (1.54,1.70) |
Mode of delivery | |||
Normal vaginal | Ref | – | Ref |
Caesarean with labour | 1.94 (1.85,2.03) | – | 1.60 (1.52,1.69) |
Caesarean without labour | 1.41 (1.35,1.48) | – | 1.06 (0.99,1.13) |
Forceps | 3.59 (3.39,3.80) | – | 2.19 (2.03,2.36) |
Vacuum | 1.88 (1.77,1.99) | – | 1.56 (1.46,1.67) |
Vaginal breech | 2.89 (2.39,3.50) | – | 1.29 (1.04,1.59) |
Induced delivery | 1.41 (1.36,1.46) | – | 1.26 (1.21,1.31) |
3rd of 4th degree perineal tear | 3.49 (3.27,3.73) | – | 2.82 (2.62,3.03) |
Episiotomy | 1.81 (1.74,1.89) | – | 1.53 (1.44,1.62) |
Cervical laceration | 29.40 (25.28,34.18) | – | 24.75 (20.96,29.22) |