Figure 19.5 is from an unmatched case–control study into the effect of passive smoking as a risk factor for coronary heart disease (CHD) in Chinese women who had never smoked. The cases were patients...

Figure 19.5 is from an unmatched case–control study into the effect of passive smoking as a risk factor for coronary heart disease (CHD) in Chinese women who had never smoked. The cases were patients with CHD, the control women without CHD. The study considered both passive smoking at home from husbands who smoked and at work from smoking co‐workers. The null hypotheses were that the population odds ratio was equal to 1, both at home and at work, that is, passive smoking had no effect on the odds for CHD. The table contains the adjusted odds ratios for CHD for a number of risk factors, with 95% confidence intervals and p‐values. Which factors do you think are likely to increase the odds of CHD in the population of such women?