Table 1 Characteristics of study population.
From: Periodontal disease and spontaneous preterm birth: a case control study
Preterm Cases n = 50 | Undelivered Controls n = 51 | Postpartum term Controls n = 50 | p value | |
|---|---|---|---|---|
Age (years) | 30.6 +/- 5.9 | 30.0 +/- 5.2 | 32.1 +/- 4.0 | 0.2* |
Nulliparity | 20 (40%) | 28 (55%) | 24 (48%) | 0.3* |
Post secondary education (years) | 2.3 +/- 2.0 | 4.1 +/- 2.9 | 4.3 +/- 2.7 | <.001* |
Gross family income ≤ $20,000. | 9 (18%) | 4 (8%) | 3 (6%) | 0.15§ |
Smoker during pregnancy | 13 (26%) | 5 (10%) | 3 (6%) | 0.01§ |
Last dental cleaning ≤ 6 months | 13 (26%) | 21 (41%) | 21 (42%) | 0.12§ |