Table 4.

Logistic regression on the associations of codes “no clear answer” and “treatment” with treatment status

Explanatory variables	OR (95% CI)
Crude model
Age	0.990 (0.874–1.123)
Sex (female)	16.364 (2.080–128.720)*
I do not know/no answer	0.055 (0.010–0.317)*
Treatment	4.170 (1.120–15.526)*
Age- and sex-adjusted model for “no clear answer”
Age	0.994 (0.854–1.157)
Sex (female)	24.297 (2.161–273.152)*
No clear answer	0.031 (0.003–0.346)*
Age- and sex-adjusted model for “treatment”
Age	1.013 (0.877–1.171)
Sex (female)	16.921 (2.107–135.892)*
Treatment	4.339 (1.104–17.055)*

The objective variable was treatment status (persistent)

*Statistically significant at p < 0.05

CI Confidence interval, OR odds ratio