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Table 3 Sexual behavior by region in Norway

From: Regional differences in cervical cancer incidence and associated risk behaviors among Norwegian women: a population-based study

Age at sexual debut
Region N Debut (%) Debut before age of consent1 (%) Mean (SE2) age at debut Median (IQR3) age at debut Adj HR4 (95% CI5) debut Adj OR6 (95% CI) debut before age of consent
 Norway 16,255 96.26 20.9 17.19 (0.02) 17 (16, 18) 1.00 (reference) 1.00 (reference)
 North 1643 97.58 30.9 16.53 (0.06) 16 (15, 17) 1.30 (1.24, 1.36)* 1.55 (1.42, 1.70)*
 Middle 1939 96.87 22.1 16.97 (0.06) 17 (16, 18) 1.04 (0.99, 1.09) 0.97 (0.89, 1.06)
 Southeast 9351 96.36 19.8 17.27 (0.03) 17 (16, 18) 0.88 (0.85, 0.91)* 0.86 (0.81, 0.91)*
 West 3322 94.93 18.4 17.39 (0.05) 17 (16, 18) 0.85 (0.81, 0.88)* 0.77 (0.71, 0.83)*
Number of sexual partners
Region N7 Median (IQR) Mean (SE) Adj OR8 (95% CI) > 2 partners Adj OR8 (95% CI) > 5 partners Adj OR8 (95% CI) > 10 partners
 Norway 15,517 5 (2, 10) 7.61 (0.08) 1.00 (reference) 1.00 (reference) 1.00 (reference)
 North 1573 6 (3, 10) 8.80 (0.24) 1.26 (1.13, 1.40)* 1.17 (1.07 1.27)* 1.11 (1.01, 1.23)*
 Middle 1867 5 (2, 10) 7.44 (0.18) 0.96 (0.88, 1.06) 0.97 (0.90, 1.05) 0.98 (0.89, 1.08)
 Southeast 8945 5 (2, 10) 7.74 (0.11) 1.05 (0.99, 1.11) 1.05 (1.00, 1.11) 1.11 (1.04, 1.18)*
 West 3130 5 (2, 8) 6.76 (0.16) 0.79 (0.73, 0.85)* 0.84 (0.79, 0.90)* 0.83 (0.76, 0.90)*
  1. 1 Debut before age 16
  2. 2 Standard error
  3. 3 Interquartile range
  4. 4 Hazard ratio adjusted for age and mode of response, from discrete-time generalized linear survival model with follow-up from birth until age 18
  5. 5 Confidence interval
  6. 6 Odds ratio adjusted for age and mode of response, from logistic regression
  7. 7 Number of women with sexual debut who reported number of sexual partners
  8. 8 Odds ratio adjusted for age, mode of response and age at sexual debut, from ordinal regression
  9. * P < 0.05