Weighted multinomial logistic regression of variables on exclusive modern contraception and dual method use (vs condom use) in sexually active women of reproductive age (15–49 years) using a modern method of contraception, in Brazil, Pesquisa Nacional Demografica e da Saúde da Criança e da Mulher 2006 (n=6017)†
| Characteristic | Unadjusted RRR (95% CI) | Adjusted RRR (95% CI) | ||
|---|---|---|---|---|
| Contraception only | Dual methods | Contraception only | Dual methods | |
| Socio-demographics | ||||
| Age (years) | ||||
| 15–19 | Ref. | Ref. | Ref. | Ref. |
| 20–24 | 2.71*** (1.75–4.19) | 1.63* (1.08–2.45) | 1.94** (1.26–3.01) | 1.40 (0.92–2.12) |
| 25–29 | 3.54*** (2.37–5.29) | 1.46 (0.98–2.19) | 2.19*** (1.43–3.36) | 1.18 (0.77–1.79) |
| 30–39 | 2.98*** (1.96–4.52) | 0.94 (0.61–1.44) | 1.41 (0.88–2.27) | 0.65 (0.40–1.07) |
| 40–49 | 2.08** (1.22–3.56) | 0.34*** (0.20–0.58) | 0.74 (0.41–1.31) | 0.18*** (0.10–0.34) |
| Education | ||||
| Primary school or less | Ref. | Ref. | Ref. | Ref. |
| Middle school | 0.75 (0.54–1.03) | 1.38 (0.96–1.99) | 1.00 (0.70–1.42) | 1.27 (0.88–1.83) |
| Some high school | 0.61* (0.42–0.91) | 1.68* (1.11–2.54) | 1.00 (0.63–1.58) | 1.69* (1.08–2.64) |
| High school or more | 0.60** (0.40–0.88) | 1.50* (1.01–2.23) | 1.14 (0.68–1.91) | 1.51 (0.91–2.49) |
| Race | ||||
| White | Ref. | Ref. | Ref. | Ref. |
| Black | 0.81 (0.63–1.04) | 0.75* (0.59–0.96) | 0.87 (0.66–1.15) | 0.87 (0.66–1.13) |
| Other | 0.54* (0.32–0.92) | 1.01 (0.58–1.73) | 0.71 (0.38–1.30) | 1.07 (0.62–1.84) |
| Religion | ||||
| None | Ref. | Ref. | Ref. | Ref. |
| Catholic | 1.30 (0.88–1.90) | 0.98 (0.65 to 1.46) | 1.20 (0.76–1.89) | 1.13 (0.75–1.69) |
| Evangelical | 0.99 (0.63–1.56) | 0.64 (0.39 to 1.04) | 0.80 (0.48–1.32) | 0.67 (0.41–1.09) |
| Afro-religion or other | 0.63 (0.34–1.18) | 0.99 (0.56 to 1.74) | 0.69 (0.34–1.40) | 1.09 (0.60–1.98) |
| Region | ||||
| Southeast | Ref. | Ref. | Ref. | Ref. |
| North | 0.57*** (0.43–0.76) | 0.47*** (0.34–0.65) | 0.43*** (0.31–0.60) | 0.40*** (0.29–0.56) |
| Northeast | 1.09 (0.83–1.43) | 0.68* (0.49–0.94) | 0.79 (0.60–1.05) | 0.61** (0.44–0.86) |
| South | 2.20*** (1.70–2.84) | 1.59** (1.17–2.17) | 1.89*** (1.42–2.52) | 1.59** (1.16–2.16) |
| Mid-West | 1.32* (1.01–1.72) | 0.98 (0.73–1.30) | 1.10 (0.82–1.46) | 0.88 (0.68–1.15) |
| Urban | ||||
| No | Ref. | Ref. | Ref. | Ref. |
| Yes | 0.59*** (0.45–0.77) | 0.88 (0.66–1.16) | 0.73* (0.54–0.99) | 0.73 (0.53–1.00) |
| Household wealth | 0.90 (0.81–1.00) | 1.09 (0.97–1.23) | 0.98 (0.83–1.14) | 1.07 (0.91–1.27) |
| Method at sexual debut | ||||
| No method | Ref. | Ref. | Ref. | Ref. |
| Contraceptive method only | 1.16 (0.81–1.67) | 1.19 (0.80–1.78) | 1.18 (0.83–1.66) | 1.37 (0.95–1.97) |
| Condom | 0.63*** (0.50–0.79) | 1.54** (1.18–2.01) | 0.82 (0.61–1.09) | 1.22 (0.93–1.61) |
| Fertility | ||||
| Number of children | 1.33*** (1.21–1.47) | 0.95 (0.84–1.06) | 1.14* (1.03–1.27) | 1.22** (1.06–1.40) |
| Wants (more) children | ||||
| Yes | Ref. | Ref. | Ref. | Ref. |
| No | 1.53*** (1.23–1.92) | 0.82 (0.64–1.05) | 1.11 (0.85–1.44) | 1.10 (0.82–1.47) |
| Don't know | 1.28 (0.75–2.19) | 0.66 (0.38–1.16) | 0.97 (0.56–1.69) | 0.66 (0.37–1.17) |
| Relationship status | ||||
| Single | 0.18*** (0.12–0.28) | 1.15 (0.80–1.64) | 0.24*** (0.16–0.36) | 0.91 (0.64–1.28) |
| Separated | 0.29*** (0.19–0.44) | 0.96 (0.66–1.40) | 0.30*** (0.20–0.47) | 0.99 (0.67–1.46) |
| Civil union | 1.12 (0.86–1.47) | 1.33 (0.99–1.79) | 1.15 (0.88–1.50) | 1.23 (0.92–1.64) |
| Married | Ref. | Ref. | Ref. | Ref. |
Adjusted model includes all variables.
***p<0.001; **p<0.01; *p<0.05.
†Multinomial logistic regression reference category is ‘Condoms'.
CI, confidence interval; RRR, relative risk ratio.