Table 1 Patient characteristics of the 3763 study participants
Variable | OMT group | Control group | Total |
|---|---|---|---|
Mean ± SD | Mean ± SD | Mean ± SD | |
N (%) | N (%) | N (%) | |
Participants | 132/3763 (3.5) | 3631/3763 (96.5) | 3763/3763 (100) |
Age at delivery (years) | 27.0 ± 4.3 | 30.4 ± 5.5 | 30.3 ± 5.5 |
Caucasian ethnicity | 130/132 (98.5) | 3588/3631 (98.8) | 3718/3763 (98.8) |
Parity | |||
 Primiparae | 64/132 (48.5) | 1186/3631 (32.7) | 1250/3763 (33.2) |
 Multiparae | 68/132 (51.5) | 2445/3631 (67.3) | 2513/3763 (66.8) |
Previous PTD | 3/68 (4.4) | 122/2445 (4.9) | 125/2513 (4.9) |
Tertiary education | 0/132 (0) | 347/3631 (9.6) | 347/3763 (9.2) |
Hepatitis B positivea | 27/132 (20.5) | n/a | n/a |
Hepatitis C positivea | 36/132 (27.3) | n/a | n/a |
HIV positivea | 8/132 (6) | n/a | n/a |
Alcohol abuse | 3/132 (2.3) | 0/3631 (0) | 3/3763 (0.1) |
Smoking status | |||
 Smoking | 112/132 (84.8) | 733/3631 (20.2) | 845/3763 (22.5) |
 Non-smoking | 20/132 (15.2) | 2898/3631 (79.8) | 2918/3763 (77.5) |
Cigarettes (per day) | 9.9 ± 7.0 | 1.4 ± 3.9 | 1.7 ± 4.3 |