Development and validation of a predictive risk factor model for epidural re-siting in women undergoing labour epidural analgesia: a retrospective cohort study

Table 3 Performance of predictive models based on training, internal and external validation data

Measures	2014–2015		2012–2013
Measures	Training data	Internal validation	External validation
C – statistic	0.894 (0.858, 0.930)	0.924 (0.882, 0.966)	0.890 (0.858, 0.923)

ISSN: 1471-2253