Table 2.

Crude and adjusted analysis of factors associated with adherence

FactorsUnivariate Poisson regressionMultivariate Poisson regression
RR (95% CI)RR (95% CI)
Mean income (neighborhood)*1.05 (1.03-1.06)1.04 (1.02-1.05)
Educational level
    ≤8 y of schooling vs >8 y of schooling0.89 (0.84-0.94)0.93 (0.88-0.99)
    Illiterate vs > 8 y of schooling0.74 (0.64-0.85)0.77 (0.67-0.90)
Age at baseline, y
    50-59 vs 40-491.02 (0.94-1.10)— (—)
    60-69 vs 40-49 1.01 (0.95-1.07)— (—)
Regular breast self-examination1.00 (0.95-1.06)— (—)
Smoking habits
    Former smoker vs never smoker1.10 (1.01-1.19)1.10 (1.01-1.19)
    Current smoker vs never smoker0.83 (0.77-0.89)0.82 (0.77-0.88)
BMI
    Between 25 and 29.9 vs <251.03 (0.96-1.10)— (—)
    ≥30 vs <250.99 (0.92-1.06)— (—)
History of OC use1.09 (1.02-1.16)1.11 (1.04-1.19)
History of HRT use1.07 (0.98-1.16)1.06 (0.98-1.15)
High genetic risk1.29 (1.16-1.44)1.25 (1.11-1.40)
No. of children
    3-4 vs 0-2 0.91 (0.86-0.97)0.91 (0.85-0.97)
    ≥5 vs 0-2 0.84 (0.78-0.90)0.89 (0.83-0.96)
Previous breast biopsy1.04 (0.92-1.19)— (—)
Enrollment during community activities/efforts0.92 (0.84-0.99)0.94 (0.86-1.02)

NOTE: Only variables with a P-value <0.20 were included in the multivariate Poisson regression.

  • *RR expressed by the increase for each R$100 (∼US$45).