Effect of team training and monitoring on the rate of failed mid and low cavity vacuum extraction: a hospital based intervention study

Table 2 Primary and secondary procedural outcome, relative risk

	Period 0 n(%)	Period 0 vs 1[CI]	Period 1 n(%)	Period 1 vs 2[CI]	Period 2 n(%)	Period 0 vs 2[CI]
Failed extraction	61 (19)		28 (8)		37 (10)
RR, crude		0.41 [0.27–0.62] p < 0.001		1.3 NS		0.53 [0.36–0.77] p 0.001
RR_a		0.48 [0.26–0.87] p 0.016		NA		0.59 NS
Complicated extraction^*	55 (17)		77 (22)		39 (11)
RR, crude		1.3 NS		0.47 [0.33–0.68] p < 0.001		0.61 [0.42–0.90] p 0.012
RR_a		NA		0.42 [0.23–0.76] p 0.004		0.53 NS

Poisson regression. P-value below 0.017 (0.05/3 for Bonferroni correction) considered significant
RR_a: adjusted by year of birth
^*duration > 15 min or number of pulls > 6, or cup detachment > 1

ISSN: 1471-2393