|
Quartiles of dietary nutrientsb
|
---|
Q1
|
Q2
|
Q3
|
Q4
|
P-trendc
|
---|
Folate
| | | | | |
Median intake (μg/day)
|
297
|
381
|
488
|
764
| |
No. of cases
|
132
|
147
|
139
|
146
| |
Model 1
|
0.91 (0.69–1.20)
|
1.01 (0.77–1.32)
|
0.91 (0.69–1.19)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
0.95 (0.72–1.26)
|
1.04 (0.79–1.37)
|
0.92 (0.70–1.21)
|
1.00 (reference)
|
0.012
|
Model 3
|
0.96 (0.72–1.27)
|
1.04 (0.79–1.37)
|
0.91 (0.69–1.21)
|
1.00 (reference)
|
0.020
|
Vitamin B1
| | | | | |
Median intake (mg/day)
|
1.1
|
1.4
|
1.9
|
2.7
| |
No. of cases
|
134
|
157
|
132
|
141
| |
Model 1
|
0.91 (0.68–1.22)
|
1.25 (0.95–1.65)
|
0.89 (0.68–1.15)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
0.98 (0.73–1.31)
|
1.31 (0.99–1.74)
|
0.89 (0.68–1.17)
|
1.00 (reference)
|
0.011
|
Model 3
|
0.99 (0.74–1.34)
|
1.33 (1.00–1.77)
|
0.91 (0.69–1.19)
|
1.00 (reference)
|
0.017
|
Vitamin B2
| | | | | |
Median intake (mg/day)
|
1.1
|
1.4
|
1.8
|
2.7
| |
No. of cases
|
123
|
148
|
157
|
136
| |
Model 1
|
0.85 (0.64–1.12)
|
1.13 (0.85–1.48)
|
1.08 (0.82–1.42)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
0.88 (0.66–1.17)
|
1.16 (0.88–1.54)
|
1.09 (0.83–1.44)
|
1.00 (reference)
|
0.011
|
Model 3
|
0.87 (0.66–1.17)
|
1.15 (0.86–1.52)
|
1.10 (0.83–1.45)
|
1.00 (reference)
|
0.020
|
Vitamin B6
| | | | | |
Median intake (mg/day)
|
1.7
|
2.1
|
2.6
|
3.9
| |
No. of cases
|
144
|
146
|
131
|
143
| |
Model 1
|
1.04 (0.79–1.36)
|
0.99 (0.76–1.30)
|
0.90 (0.69–1.19)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
1.08 (0.82–1.43)
|
1.00 (0.76–1.32)
|
0.90 (0.68–1.19)
|
1.00 (reference)
|
< 0.001
|
Model 3
|
1.09 (0.83–1.44)
|
0.99 (0.75–1.31)
|
0.91 (0.69–1.21)
|
1.00 (reference)
|
0.019
|
Vitamin C
| | | | | |
Median intake (mg/day)
|
46.0
|
62.8
|
86.9
|
138.9
| |
No. of cases
|
124
|
149
|
145
|
146
| |
Model 1
|
0.85 (0.65–1.13)
|
1.05 (0.81–1.38)
|
1.01 (0.77–1.33)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
0.87 (0.65–1.16)
|
1.09 (0.83–1.44)
|
1.04 (0.79–1.36)
|
1.00 (reference)
|
0.012
|
Model 3
|
0.86 (0.65–1.15)
|
1.09 (0.83–1.44)
|
1.04 (0.79–1.37)
|
1.00 (reference)
|
0.021
|
Vitamin E
| | | | | |
Median intake (mg/day)
|
4.4
|
8.8
|
10.8
|
21.7
| |
No. of cases
|
131
|
135
|
151
|
147
| |
Model 1
|
0.83 (0.63–1.09)
|
0.86 (0.65–1.13)
|
1.08 (0.83–1.42)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
0.84 (0.63–1.11)
|
0.88 (0.67–1.16)
|
1.09 (0.83–1.44)
|
1.00 (reference)
|
0.013
|
Model 3
|
0.85 (0.64–1.12)
|
0.87 (0.66–1.16)
|
1.10 (0.83–1.45)
|
1.00 (reference)
|
0.023
|
Vitamin K
| | | | | |
Median intake (μg/day)
|
133.0
|
194.0
|
285.0
|
534.0
| |
No. of cases
|
125
|
159
|
139
|
141
| |
Model 1
|
0.94 (0.71–1.23)
|
1.23 (0.93–1.62)
|
1.00 (0.77–1.31)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
0.96 (0.73–1.27)
|
1.24 (0.94–1.64)
|
1.01 (0.77–1.33)
|
1.00 (reference)
|
0.010
|
Model 3
|
0.98 (0.74–1.29)
|
1.24 (0.94–1.65)
|
1.03 (0.79–1.36)
|
1.00 (reference)
|
0.017
|
Niacin
| | | | | |
Median intake (mg/day)
|
17.7
|
21.6
|
27.9
|
42.8
| |
No. of cases
|
147
|
140
|
135
|
142
| |
Model 1
|
1.11 (0.84–1.46)
|
0.96 (0.73–1.27)
|
0.96 (0.73–1.26)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
1.14 (0.86–1.51)
|
0.97 (0.74–1.28)
|
0.93 (0.71–1.23)
|
1.00 (reference)
|
0.012
|
Model 3
|
1.15 (0.87–1.53)
|
0.96 (0.73–1.26)
|
0.94 (0.72–1.25)
|
1.00 (reference)
|
0.020
|
Dietary fiber
| | | | | |
Median intake (g/day)
|
27.4
|
34.5
|
43.7
|
63.2
| |
No. of cases
|
138
|
148
|
136
|
142
| |
Model 1
|
0.99 (0.75–1.30)
|
1.07 (0.82–1.41)
|
0.92 (0.70–1.21)
|
1.00 (reference)
|
< 0.001
|
Model 2
|
1.05 (0.79–1.39)
|
1.12 (0.85–1.47)
|
0.93 (0.71–1.23)
|
1.00 (reference)
|
0.010
|
Model 3
|
1.05 (0.79–1.39)
|
1.12 (0.85–1.48)
|
0.95 (0.72–1.25)
|
1.00 (reference)
|
0.018
|
- CIN1, cervical intraepithelial neoplasia grade 1; CI, confidence interval
- aValues are n or ORs (95% CIs) obtained from logistic regression analysis, based on the highest intake group as the reference, unless otherwise indicated
- bModel 1: odds ratios unadjusted; Model 2: odds ratios adjusted for age, education years, annual family salary, smoker, age at menarche, menopause status, IUD use, years of IUD use, Sexual activity in menstrual period, had gynecologic surgery, had vaginitis; Model 3: additionally odds ratios adjusted for high-risk HPV, SCJ visibility, vaginal pH
- cP values for differences between groups were obtained from the Bonferroni correction test for categoric variables