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Table 2 Distribution of selected parturient risk factors by physician quartile

From: Risk-adjusted cesarean section rates for the assessment of physician performance in Taiwan: a population-based study

  Physician quartile χ2 test on distribution of patient risks χ2 test on CS rate for patient risks
  Quartile 1 Quartile 2 Quartile 3 Quartile 4   
  No. % CS rate No. % CS rate No. % CS rate No. % CS rate p value p value
Obstetric factors               
   Malpresentation 2314 5.65 97.84 3881 7.13 99.15 3559 7.83 98.65 2982 9.43 99.56 < 0.0001 < 0.0001
   Prolapsed cord 12 0.03 91.67 31 0.06 100.00 15 0.03 86.67 13 0.04 84.62 0.14 0.20
   Antepartum hemorrhage, abruptio/previa placenta 335 0.82 89.55 811 1.49 94.45 783 1.72 93.49 982 3.11 97.76 < 0.0001 < 0.0001
Pregnancy factors               
   Previous CS history 3373 8.23 95.67 5879 10.79 96.19 6233 13.71 97.83 5201 16.45 98.96 < 0.0001 < 0.0001
   Insufficient or excessive fetal growth 232 0.57 64.66 379 0.70 73.09 365 0.80 84.93 280 0.89 88.21 < 0.0001 < 0.0001
   Genital herpes 12 0.03 50.00 21 0.04 80.95 23 0.05 56.52 21 0.07 95.24 0.10 0.0066
   Diabetes mellitus 185 0.45 35.14 194 0.36 56.19 175 0.38 64.00 117 0.37 79.49 0.11 < 0.0001
   Anemia 583 1.42 42.88 745 1.37 58.66 486 1.07 63.58 472 1.49 81.14 < 0.0001 < 0.0001
   Cardiac disease 13 0.03 46.15 42 0.08 64.29 30 0.07 50.00 31 0.10 80.65 0.0047 0.0477
   Arterial hypertension 175 0.43 41.71 217 0.40 63.59 162 0.36 61.73 111 0.35 78.38 0.25 < 0.0001
   Eclampsia/preeclampsia 282 0.69 62.41 369 0.68 82.66 403 0.89 83.62 330 1.04 92.73 < 0.0001 < 0.0001
   Polyhydramnios/oligohydramnios 92 0.22 33.70 107 0.20 60.75 106 0.23 65.09 74 0.23 67.57 0.56 < 0.0001
   Infection of the amniotic cavity 57 0.14 49.12 82 0.15 74.39 76 0.17 92.11 85 0.27 87.06 0.0001 < 0.0001
   Congenital/acquired abnormality of cervix/vagina 7 0.02 42.86 14 0.03 79.57 16 0.04 93.75 13 0.04 100.00 0.22 0.0053
   Premature labor 1269 3.10 24.11 1798 3.30 42.32 1626 3.58 53.75 1186 3.75 63.83 < 0.0001 < 0.0001
   Premature rupture of membranes 1283 3.13 19.56 1974 3.62 26.55 1715 3.77 31.66 1092 3.45 48.08 < 0.0001 < 0.0001
   Cervical incompetence 8 0.02 12.50 22 0.04 27.27 23 0.05 39.13 40 0.13 75.00 < 0.0001 0.0002
Other risk factors               
   Nulliparous 19,726 48.14 20.86 26,622 48.88 29.38 22,882 50.34 37.24 15,504 49.03 50.79 < 0.0001 < 0.0001
Gestational weeks               
< 37 3008 7.34 34.71 4419 8.11 43.77 3932 8.65 54.43 2983 9.43 64.30 - < 0.0001
≥ 42 131 0.32 22.90 198 0.36 36.36 145 0.32 40.69 102 0.32 50.00 < 0.0001 0.0002
   Multiple gestation 975 2.40 65.33 1400 2.57 77.57 1432 3.15 85.61 1441 4.56 90.35 < 0.0001 < 0.0001
   Maternal age ≥ 35 yr 4212 10.28 34.59 5752 10.56 47.79 5699 12.54 54.17 4753 15.03 64.09 < 0.0001 < 0.0001