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Table 2 Number of births and prevalence of amniotomy between 2017-2020a

From: Prevalence of amniotomy in Sweden: a nationwide register study

  

2017

2018

2019

2020a

p-valueb

Post-hoc testc

All births,

Number of births, n

94,642

94,958

93,604

47,709

  

n = 330,913

Amniotomy, n (%)

38,612 (40.8)

38,880 (40.9)

37,560 (40.1)

19,441 (40.7)

 0.678

 

Robson group 1 and 3,

Number of births, n

64,615

64,042

61,528

29,776

  

n = 219,961

Amniotomy, n (%)

24,200 (37.5)

23,518 (36.7)

21,788 (35.4)

10,147 (34.1)

 < 0.001

 ABCDEF

Robson group 1,

Number of births, n

28,888

28,935

27,529

13,090

  

n = 98,442

Amniotomy, n (%)

12,163 (42.1)

11,989 (41.4)

11,099 (40.3)

5186 (39.6)

 < 0.001

 -BCDE-

Robson group 3,

Number of births, n

35,727

35,107

33,999

16,686

  

n = 121,519

Amniotomy, n (%)

12,037 (33.7)

11,529 (32.8)

10,689 (31.4)

4961 (29.7)

 < 0.001

 -BCDEF

  1. a 1 January to 30 June, 2020
  2. b Pearson chi-square test
  3. c Pairwise comparisons using the Pearson chi-square test with Bonferroni corrected p-values (< 0.008); significant differences are presented as: A = 2017 ≠ 2018, B = 2017 ≠ 2019, C = 2017 ≠ 2020, D = 2018 ≠ 2019, E = 2018 ≠ 2020, F = 2019 ≠ 2020,