Table 1 Predictors of species 7 and 9-type specific incident^a HPV infections^b

Age (at study entry; continuous var)

0.98

0.96-1.02

0.090

0.99

0.98-1.01

0.678

Mother seroconverted to HR-HPV

   No

Ref

   Yes

0.81

0.67-0.98

0.039

0.84

0.69-1.03

0.106

Mother seropositive to HR-HPV at baseline

   Yes

Ref

   No

1.10

0.85-1.42

0.463

Baseline oral HR-HPV DNA status

   HR-HPV-

Ref

   HR-HPV+

0.80

0.54-1.19

0.285

Baseline PAP smear

   ASCUS+

Ref

   Negative (WNL)

1.76

0.76-4.10

0.184

Marital Status at baseline

   Singe

Ref

   Married

1.19

0.77-1.81

0.419

   Living with partner

1.30

0.86-1.97

0.208

   Divorced

1.42

0.95-2.15

0.086

Employment status

   Employed

Ref

   Student

0.82

0.61-1.10

0.192

   Unemployed

0.90

0.75-1.07

0.257

Age at onset of sexual activity

   Below 13 years

Ref

   Above 13 years

1.15

1.05-1.27

0.003

1.05

0.93-1.17

0.394

No. of sexual partners until age of 20 yrs

   0-2 partners

Ref

   3-5 partners

0.89

0.76-1.05

0.201

   6-10 partners

1.05

0.92-1.19

0.410

   > 10 partners

0.73

0.46-1.18

0.206

Life-time number of sexual partners

   1-2 partners

Ref

   3-5 partners

1.12

1.02-1.24

0.015

1.12

1.02-1.23

0.011

   6-10 partners

0.83

0.61-1.13

0.246

0.85

0.62-1.16

0.311

   > 10 partners

0.81

0.63-1.04

0.105

0.81

0.63-1.04

0.104

No. of weekly intercourse

   0-1 intercourse

Ref

   2-4 intercourses

NC

   5-10 intercourses

NC

   > 10 intercourses

NC

   > 10 vs. 0-1 (only calculable)

1.03

0.88-1.14

0.961

No. of deliveries in all partnerships (continuous var)*

1.06

0.98-1.15

0.107

Practices of oral sex

   No

Ref

   Yes

1.02

0.87-1.20

0.739

Practices of anal sex

   No

Ref

   Yes

1.22

0.97-1.55

0.087

1.16

0.83-1.62

0.375

Initiation of OC usage

   Above 20 years

Ref

   Below 20 years

1.32

1.04-1.23

0.004

1.13

1.02-1.26

0.017

OC use (Y/N)

   Never use

Ref

   Ever use

1.01

0.74-1.37

0.948

Smoking habits

   Never smoker

Ref

   Ever smoker

1.06

0.92-1.21

0.384

Initiation of smoking

   10-13 years of age

   > 13 years of age

1.16

1.01-1.35

0.028

1.11

0.95-1.31

0.159

History of STD

   Yes

Ref

   No

1.06

0.89-1.27

0.505

History of genital warts

   No

Ref

   Yes

0.93

0.81-1.08

0.372

History of oral warts

   Yes

Ref

   No

1.08

0.79-1.32

0.823

2nd pregnancy during FU

   No 2^nd pregnancy during FU

Ref

   Yes, 2^nd pregnancy during FU

0.29

0.16-0.55

0.0001

0.32

0.17-0.61

0.0001

Change in marital status during FU*

   No

Ref

   Yes; living with partner

0.74

0.41-1.32

0.315

0.78

0.48-1.28

0.340

   Yes, married

1.04

0.89-1.22

0.572

1.10

0.84-1.45

0.474

   Yes, divorced

1.11

1.01-1.22

0.019

1.16

0.97-1.40

0.102

No. of current sexual partners*

   No

Ref

   1 or more

1.02

1.00-1.04

0.027

**