Table 1 Characteristics of study population.
From: Periodontal disease and preterm delivery: a nationwide population-based cohort study of Taiwan
Variable | Nonpremature birth | Premature birth | p valuea | ||
|---|---|---|---|---|---|
n = 1,554,042 | Rate (%) | n = 191,036 | Rate (%) | ||
Mother age (years) | |||||
20 ≤ Age ≤ 25 | 368,046 | 88.61 | 47,315 | 11.39 | < 0.001 |
25 < Age ≤ 30 | 629,297 | 89.66 | 72,566 | 10.34 | |
30 < Age ≤ 35 | 426,998 | 89.01 | 52,698 | 10.99 | |
Age > 35 | 129,701 | 87.54 | 18,457 | 12.46 | |
Monthly income | |||||
Dependent | 354,617 | 89.03 | 43,685 | 10.97 | < 0.001 |
< NT$20,000 | 465,966 | 89.43 | 55,076 | 10.57 | |
NT$20,000–$40,000 | 522,330 | 89.23 | 63,016 | 10.77 | |
> NT$40,000 | 211,129 | 87.83 | 29,259 | 12.17 | |
Individual obstetric history | |||||
Multifetal pregnancy | 6,906 | 47.21 | 7,721 | 52.79 | < 0.001 |
Placental abnormality | 153,632 | 83.18 | 31,057 | 16.82 | < 0.001 |
Diabetes mellitus complicating pregnancy | 190,966 | 85.36 | 32,745 | 14.64 | < 0.001 |
Vaginal infection | 1,391,265 | 88.99 | 172,105 | 11.01 | < 0.001 |
Autoimmune disease | 482,45 | 85.87 | 7,942 | 14.13 | < 0.001 |
Hypertension complicating pregnancy | 30,975 | 71.70 | 12,224 | 28.30 | < 0.001 |
Psychological factor(s) | 306,618 | 87.03 | 45,683 | 12.97 | < 0.001 |
Periodontal disease | |||||
No | 825,399 | 89.44 | 97,447 | 10.56 | < 0.001 |
Yes | 728,643 | 88.62 | 93,589 | 11.38 | |
Periodontal disease | |||||
No PD | 825,399 | 89.44 | 97,447 | 10.56 | < 0.001 |
Mild PD | 580,190 | 88.69 | 73,990 | 11.31 | |
Advanced PD | 148,453 | 88.34 | 19,599 | 11.66 | |
