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Table 2 Comparison of the standardised differences of baseline characteristics before and after matching for facility-level availability of the national ANC guideline

From: The effect of national antenatal care guidelines and provider training on obstetric danger sign counselling: a propensity score matching analysis of the 2014 Ethiopia service provision assessment plus survey

Variable Unmatched Per cent (%) Bias (%) Reduced bias (%) t-test
Matched Treated Control t p
Age category in years:
 15–20
Unmatched 21.1 25.3 − 10.0 88.9 − 2.04 0.042
Matched 23.5 24.0 − 1.1 − 0.20 0.844
 21–25 Unmatched 33.0 31.0 4.3 − 55.7 0.89 0.376
Matched 34.5 31.4 6.7 1.19 0.234
 26–30 Unmatched 34.1 30.2 8.4 0.1 1.73 0.085
Matched 28.7 32.7 − 8.3 − 1.52 0.129
 ≥30 Unmatched 11.7 13.5 − 5.2 26.9 − 1.05 0.293
Matched 13.2 11.9 3.8 0.68 0.499
Ever attended school Unmatched 71.7 66.5 11.3 78.9 2.30 0.021
Matched 69.5 68.4 2.4 0.42 0.672
Gestational age:
 First trimester
Unmatched 7.3 5.7 6.2 79.5 1.28 0.200
Matched 5.7 5.3 1.3 0.25 0.806
 Second trimester Unmatched 35.7 37.2 − 3.2 − 50.6 − 0.66 0.507
Matched 35.3 37.7 − 4.9 − 0.87 0.383
 Third trimester Unmatched 57.1 57.0 0.1 − 6040.7 0.01 0.989
Matched 59.0 57.0 4.1 0.74 0.461
First-time pregnancy Unmatched 33.7 33.9 − 0.6 − 698.4 − 0.13 0.899
Matched 36.6 34.2 5.0 0.88 0.380
ANC visit is first Unmatched 44.3 47.1 − 5.6 55.0 − 1.15 0.252
Matched 44.1 45.4 − 2.5 − 0.45 0.652
Facility is urban Unmatched 83.4 70.7 30.4 97.5 6.12 0.000
Matched 81.3 81.0 0.8 0.14 0.886
The facility owner is government Unmatched 87.1 82.4 13.3 50.5 2.68 0.007
Matched 85.9 88.2 − 6.6 − 1.25 0.211
Facility is hospital or health centre Unmatched 97.1 95.6 7.6 55.8 1.53 0.127
Matched 96.9 97.5 − 3.4 − 0.68 0.499
Facility is supervised at the zonal level Unmatched 47.9 55.4 − 15.3 85.6 − 3.13 0.002
Matched 53.2 52.1 2.2 0.39 0.695
ANC provider is Nurse or Midwife Unmatched 87.1 83.8 9.6 95.3 1.94 0.052
Matched 85.9 85.7 0.4 0.08 0.936
HMIS is available Unmatched 97.2 93.5 17.8 95.8 3.52 0.000
Matched 96.9 96.7 0.7 0.16 0.874