Differential Effect of Vaginal Microbiota on Spontaneous Preterm Birth among Chinese Pregnant Women
Table 1
Characteristics of study participants between the sPTB and controls.
Characteristics
Controls
sPTB
a
Age (years)
28 (26-30)b
28 (25-30)
0.660
Gestational age at baseline (weeks)
16.43 (15.57-17.00)
16.29 (13.86-16.57)
0.153
Prepregnancy BMI
20.95 (19.31-22.77)
20.96 (19.53-23.63)
0.989
Ethnicity
Chinese Han
305 (99.03)c
40 (97.56)
0.395
Education level
Primary/junior high school
80 (25.97)
6 (14.64)
0.141
High school
56 (18.18)
12 (29.27)
College or above
172 (55.84)
23 (56.10)
Periodontitis
No
220 (71.43)
32 (78.05)
0.085
Bleeding but untreated
68 (22.08)
4 (9.76)
Diagnosed and treated
11 (3.57)
4 (9.76)
Diagnosed but untreated
9 (2.92)
1 (2.44)
Vaginal douche habit
Never
253 (82.14)
30 (73.17)
0.209
Ever but no more
17 (5.52)
5 (12.20)
Yes
38 (12.34)
6 (14.63)
Passive smokingd
<1 day/week
242 (78.57)
33 (80.49)
0.737
1-3 days/week
34 (11.04)
6 (14.63)
3-6 days/week
4 (1.30)
0 (0.00)
Nearly everyday
28 (9.09)
2 (4.88)
GDM
No
285 (92.53)
33 (80.49)
0.018
a values for continuous variables were calculated using the Wilcoxon test, and values for categorical variables were calculated using the Fisher test. bMedian (interquartile range). cNumber (percentage). dPassive smoking was measured by days per week with passive smoking over 15 minutes. BMI: body mass index (kg/m2); GDM: gestational diabetes mellitus.
