Skip to main content

Table 2 Primary and secondary procedural outcome, relative risk

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

  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
RRa   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
RRa   NA   0.42
[0.23–0.76]
p 0.004
  0.53
NS
  1. Poisson regression. P-value below 0.017 (0.05/3 for Bonferroni correction) considered significant
  2. RRa: adjusted by year of birth
  3. *duration > 15 min or number of pulls > 6, or cup detachment > 1