Variables | 2011-2012 | 2015-2016 | *p1 | *p2 | *p3 | ||||
Total N = 2043 | Episiotomy n = 1214 | No Episiotomy n = 829 | Total n = 2225 | Episiotomy n = 983 | No Episiotomy n = 1242 | ||||
Age (in years)—md [95% CI] | 24.00 [24.66 - 25.23] | 22.00 [26.69 - 27.60]a | 26.00 [26.69 - 27.60]b | 24.00 [24.88 - 25.44] | 22.00 [23.13 - 23.90]a | 26.00 [26.19 - 26.96]b | 0.204 | ≤0.0001 | ≤0.0001 |
Number of Previous Gestations—md [95% CI] | 2.00 [2.20 - 2.38] | 1.00 [1.59 - 1.81]a | 3.00 [3.06 - 3.33]b | 2.00 [2.02 - 2.13] | 1.00 [1.44 - 1.54]c | 2.00 [2.48 - 2.65]d | 0.004 | ≤0.0001 | ≤0.0001 |
Number of Previous Deliveries—md [95% CI] | 1.00 [0.91 - 1.04] | 0.00 [0.37 - 0.46]a | 1.00 [1.72 - 1.95]b | 0.00 [0.74 - 0.84] | 0.00 [0.21 - 0.28]c | 1.00 [1.17 - 1.32]d | ≤0.0001 | ≤0.0001 | ≤0.0001 |
Number of Previous Cesareans—md [95% CI] | 0.00 [0.06 - 0.09] | 0.00 [0.06 - 0.09] | 0.00 [0.05 - 0.09] | 0.00 [0.07 - 0.10] | 0.00 [0.07 - 0.10] | 0.00 [0.07 - 0.10] | 0.241 | 0.803 | 0.707 |
Number of Previous Abortions#—md [95% CI] | 0.00 [0.18 - 0.24] | 0.00 [0.13 - 0.19]a | 0.00 [0.23 - 0.33]b | 0.00 [0.18 - 0.22] | 0.00 [0.13 - 0.19]ac | 0.00 [0.21 - 0.27]bd | 0.553 | ≤0.0001 | ≤0.0001 |
Weight (in kg)—md [95% CI] | 75.00 [75.97 - 77.21] | 74.40 [74.93 - 76.50]a | 76.10 [77.01 - 79.03]bc | 76.50 [78.05 - 79.37] | 75.00 [76.03 - 77.92]ab | 78.00 [79.27 - 81.08]c | ≤0.0001 | ≤0.0001 | ≤0.0001 |
BMI (in kg/m2)— md [95% CI] | 29.10 [29.43 - 29.87] | 28.60 [28.93 - 29.48]a | 29.70 [29.97 - 30.69]b | 29.50 [29.94 - 30.40] | 29.00 [29.28 - 29.94]a | 30.00 [30.32 - 30.96]b | 0.009 | ≤0.0001 | ≤0.0001 |
GA (in weeks)—md [95% CI] | 39.43 [39.12 - 39.26] | 39.43 [39.18 - 39.36]ab | 39.29 [38.95 - 39.19]a | 39.43 [39.15 - 39.29] | 39.57 [39.22 - 39.44]b | 39.43 [39.03 - 39.23]a | 0.333 | ≤0.0001 | 0.001 |
Ethnicity—n (n%) White Not white |
1511 (74.0) 532 (26.0) |
927 (76.4) 287 (23.6) |
584 (70.4) 244 (29.6) |
1689 (76.0) 534 (24.0) |
782 (79.6) 201 (20.4) |
907 (73.1) 333 (26.9) | 0.137 | ≤0.0001 | ≤0.0001 |