Table 3 Differences in variables related to childbirth between the study groups
From: Aetiological factors in molar incisor hypomineralisation: a case-control study from Salamanca, Spain
Factor | Percentage (frequency) | Chi-squared test | ||||
|---|---|---|---|---|---|---|
Total sample (n = 140) | Case group (n = 70) | Control group (n = 70) | Statistical | p value | ||
Duration of pregnancy | 1.56 | 0.669NS | ||||
28–31 weeks | 5.7% (8) | 4.3% (3) | 7.1% (5) | |||
32–34 weeks | 20.0% (28) | 21.4% (15) | 18.6% (13) | |||
35–37 weeks | 66.4% (93) | 64.3% (45) | 68.6% (48) | |||
> 38 weeks | 7.9% (11) | 10.0% (7) | 5.7% (4) | |||
Type of Delivery | 0.76 | 0.384NS | ||||
Vaginal | 62.1% (87) | 65.7% (46) | 58.6% (41) | |||
C-Section | 37.9% (53) | 34.3% (24) | 41.4% (29) | |||
Duration of labour | 0.04 | 0.981NS | ||||
< 4 h | 55.0% (77) | 55.7% (39) | 54.3% (38) | |||
Between 4–8 h | 17.1% (24) | 17.1% (12) | 17.1% (12) | |||
> 8 h | 27.9% (39) | 27.1% (19) | 28.6% (20) | |||
Newborn birth weight | 3.58 | 0.058NS | ||||
< 3 kg | 40.7% (57) | 48.6% (34) | 32.9% (23) | |||
> 3 kg | 59.3% (83) | 51.4% (35) | 67.1% (47) | |||