Research Article
Twin Pregnancy in Brazil: A Profile Analysis Exploring Population Information from the National Birth E-Registry on Live Births
Table 2
Sociodemographic and obstetrical characteristics of women in twin and single pregnancies, Brazil, SINASC 2011-2014.
| | Characteristics | Twin pregnancy n (%) | Single pregnancy n (%) | Cramer V |
| | Schooling | | | 0.0194 | | None | 6 (0.0) | 1 346 (0.01) | | | Primary I | 1 230 (0.96) | 90 740 (0.81) | | | Primary II | 5 729 (4.48) | 483 057 (4.31) | | | High school | 26 017 (20.36) | 2 545 424 (22.72) | | | Superior incomplete | 65 492 (51.25) | 6 256 239 (55.85) | | | Superior complete | 29 313 (22.94) | 1 824 983 (16.29) | | | Age (years) | | | 0.0280 | | < 20 | 14 225 (10.94) | 2 208 896 (19.34) | | | 20-34 | 92 963 (71.51) | 7 911 889 (69.27) | | | 35 or above | 22 813 (17.55) | 1 300 704 (11.39) | | | Marital condition | | | 0.0000 | | With partner | 78 626 (61.10) | 6 259 141 (55.52) | | | Without partner | 50 050 (38.90) | 5 015 487 (44.48) | | | Skin color/ethnicity | | | 0.0000 | | White | 55 354 (44.44) | 4 322 827 (39.41) | | | Non-white | 69 196 (55.56) | 6 644 858 (60.59) | | | Parity | | | 0.0073 | | 0 | 42 023 (38.44) | 3 931 147 (41.80) | | | ≥ 1 | 67 302 (61.56) | 5 474 223 (58.20) | | | Number of previous C-sections | | | 0.0065 | | 0 | 75 966 (71.93) | 6 768 826 (74.59) | | | ≥ 1 | 29 644 (28.07) | 2 305 741 (25.41) | | | Number of prenatal visits | | | 0.0000 | | < 7 | 47 873 (37.22) | 4 158 908 (36.77) | | | ≥ 7 | 80 752 (62.78) | 7 151 902 (63.23) | | | Place of delivery | | | 0.0061 | | Hospital | 128 707 (99.01) | 11 226 686 (98.30) | | | Another health facility | 554 (0.43) | 89 796 (0.79) | | | Home | 568 (0.44) | 90 158 (0.79) | | | Others | 164 (0.13) | 14 336 (0.13) | |
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Missing data: (a) 222 131. (b) 217. (c) 148 403. (d) 459 472. (e) 2 037 012. (f) 2 371 530. (g) 112 272. (h) 738.
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