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Table 1 Number of deliveries and CDs broken down by sociodemographic, clinical and organizational variables in the study population

From: Determinants of cesarean delivery: a classification tree analysis

  Number of deliveries Number of CDs Percentage of CDs
Entire populations 213,539 64,622 30.3
Age    
<18 707 113 16.0
18–24 23,677 4,827 20.4
25–29 48,436 12,402 25.6
30–34 76,593 22,921 29.9
35–39 52,265 19,012 36.4
>39 11,861 5,347 45.1
Citizenship    
Italian 159,979 50,334 31.5
High-income country 1,997 547 27.4
Low-income country 51,563 13,741 26.7
Marital status    
Single 52,995 15,989 30.2
Married 144,153 43,578 30.2
Divorced/separated 5,133 1,904 37.1
Widow 346 141 40.8
Not declared 10,912 3,010 27.6
Maternal education    
Primary 9,749 2,749 28.2
Secondary 58,661 18,106 30.9
High-school 96,551 29,118 30.2
University 48,578 14,604 30.1
Paternal education    
Primary 6,507 1,898 29.2
Secondary 68,922 20,726 30.1
High-school 81,059 24,468 30.2
University 33,837 10,285 30.4
Unknown 23,214 7,245 31.2
Comorbidities    
Thyroid diseases 342 143 41.8
Substance abuse 51 26 51.0
Hypertension 4,198 2,204 52.5
Diabetes 3,105 1,635 52.7
Other severe diseases 1,196 751 62.8
Lung diseases 190 145 76.3
HIV 182 175 96.2
Genital herpes 17 17 100.0
Obstetrical conditions    
Premature rupture of membranes 28,971 5,690 19.6
Rh-isoimmunization 1,871 496 26.5
Oligohydramnios 7,550 2,560 33.9
Previous still birth/abortion 36,673 12,665 34.5
Fetal anomalies 2,309 1,076 46.6
Dystocia 7,054 3,583 50.8
Intrauterine growth retardation 6,602 3,695 56.0
Polyhydramnios 491 315 64.2
Infections of the amniotic cavity 176 120 68.2
Eclampsia/pre-eclampsia 3,175 2,319 73.0
Fetopelvic disproportion 2,514 1,843 73.3
Abortion threads/assisted fecundation/supervision of high risk pregnancy 668 459 68.7
Multiple pregnancy 3,222 2,826 87.7
Fetal distress 5,721 5,086 88.9
Mal-position/Mal-presentation of fetus 12,965 11,870 91.6
Repeat CD 23,696 22,059 93.1
Abruptio placentae/placenta previa/ante-partum hemorrhage 2,675 2,546 95.2
Cord prolapse 138 135 97.8
Pregnancy length    
At term 193,893 54,205 28.0
Pre-term 15,664 9,430 60.2
Post-term 3,733 910 24.4
Unknown 249 77 30.9
Infant birth weight (g)    
≤1500 10,633 6,534 61.5
1501–2499 1,783 1,506 84.5
2500–3999 185,432 52,306 28.2
≥4000 15,471 4,178 27.0
Unknown 220 98 44.5
Multiparity    
Nulliparous 117,095 35,700 30.5
Multiparous 96,444 28,922 30.0
Type of hospital    
Teaching 58,600 19,868 33.9
Non teaching 154,939 44,754 28.9
Activity volume (mean number of annual deliveries)    
100–500 7,286 2,674 36.7
501–799 21,872 6,228 28.5
800–999 19,439 5,070 26.1
1000–2499 96,340 29,255 30.4
≥2500 68,602 21,395 31.2
Day of delivery    
Working days 158,265 53,282 33.7
Non-working days 55,274 11,340 20.5
Time of delivery    
Daytime (7:01 a.m. – 6:59 p.m.) 142,929 51,333 35.9
Nighttime (7:00 p.m. – 7:00 a.m.) 70,610 13,289 18.8