Table 2.

HRs for a diagnosis of CIN3+ according to smoking among women with persistent high-risk HPV infection (n = 312)

Cases/non-casesHRHRaHRb95% CI
Smoking
Never28/84111
Ever68/1321.471.421.350.86–2.12
 Smoking statusc
  Former20/461.311.231.200.67–2.13
  Current48/861.541.521.450.89–1.45
 Smoking duration,c y
  ≤49/161.541.431.270.60–2.71
  5–927/561.401.391.380.80–2.35
  ≥1032/601.511.431.360.80–2.31
 Smoking intensityc
  1–9 cigarettes/d14/351.191.221.180.62–2.25
  10–19 cigarettes/d29/591.411.271.190.70–2.02
  ≥20 cigarettes/d25/381.781.861.841.05–3.22
 Smoking initiationc
  ≤14 y old23/361.801.731.530.86–2.75
  15–18 y old38/801.331.291.260.77–2.06
  ≥19 y old7/161.411.481.480.64–3.43
Age at baseline, y
22–2426/69111
25–2734/731.241.161.180.70–1.98
28–3236/741.271.131.180.70–2.00
HPV type at baseline
Non-HPV16 high-risk44/16311
HPV1652/532.692.50

NOTE: Bold value indicates CI does not include 1.

  • aAdjusted for ever given birth and length of schooling.

  • bAdjusted for ever given birth, length of schooling, and HPV type.

  • cNever smoking is the reference category.