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Table 2 Hierarchical logistic regressions, non-operative vaginal deliveries

From: How did episiotomy rates change from 2007 to 2014? Population-based study in France

  Episiotomy (2007–2014) Episiotomy (2010–2014) Episiotomy (2013–2014)c
aOR 95% CI aOR 95% CI aOR 95% CI
Maternal age (ref ≥ 40 years)
  < 20 0.89 [0.87–0.91] 0.89 [0.86–0.92] 0.85 [0.81–0.90]
 20–29 1.03 [1.01–1.05] 1.03 [0.99–1.04] 0.98 [0.94–1.02]
 30–39 1.09 [1.07–1.12] 1.07 [1.05–1.09] 1.04 [1.01–1.08]
Single pregnancy (ref = 0) 0.74 [0.72–0.76] 0.57 [0.55–0.59] a a
Breech vaginal delivery (ref = 0) 1.27 [1.23–1.30] 1.45 [1.41–1.48] 1.59 [1.49–1.67]
Epidural analgesia (ref = 0) 1.45 [1.43–1.47] 1.43 [1.43–1.45] 1.47 [1.45–1.52]
Non-reassuring fetal heart rate (ref = 0) 1.47 [1.47–1.49] 1.49 [1.47–1.52] 1.49 [1.47–1.54]
Status of health establishment (ref = Private) 1.33 [1.12–1.56] 1.30 [1.09–1.54] 1.37 [1.15–1.64]
Year of delivery (ref = 2014)
 2007 1.63 [1.61–1.64]     
 2008 1.58 [1.56–1.60] a a a a
 2009 1.46 [1.44-1.48] a a a a
 2010 1.37 [1.36-1.39] 1.37 [1.35–1.38] a a
 2011 1.31 [1.29-1.32] 1.30 [1.29–1.32] a a
 2012 1.21 [1.20-1.23] 1.21 [1.20–1.23] a a
 2013 1.13 [1.12-1.15] 1.13 [1.12–1.15] 1.13 [1.11–1.14]
Parity (ref = multiparous women) 3.85 [3.84–4.00] 4.00 [4.00–4.17] 4.17 [4.17–4.35]
Gestational age (ref > 41 WA)
  < 37WA b b 0.42 [0.40-0.44] 0.42 [0.39–0.45]
 37-41WA b b 0.82 [0.79-0.85] 0.82 [0.77–0.87]
Newborn weight (ref < 4000 g) b b b b 1.54 [1.49-1.56]
  1. aOR: Adjusted Odds ratio, CI: Confidence Interval, WA: Weeks of Amenorrhea
  2. aNot studied
  3. bNot available in database
  4. cOnly single pregnancy