Table 3. Prevalence and sex-related odds of Charlson score in patients starting long-term oxygen therapy for chronic obstructive pulmonary disease, 1992–2008.

Charlson score	Prevalence in Women, n (%)	Prevalence in Men, n (%)	Adjusted Odds Ratio for Women Compared to Men*	95% Confidence Interval	P-value
0	2440 (51)	1962 (50)	1.00	0.91–1.09	0.921
1	1371 (29)	1012 (26)	0.79	0.71–0.88	<0.001
2	616 (13)	517 (13)	0.62	0.53–0.72	<0.001
3	224 (5)	235 (6)	0.49	0.39–0.62	<0.001
>3	132 (3)	203 (5)	-	-	-

Percentages may not add up to 100 due to rounding.

^*Generalized ordered odds ratio adjusted for age, smoking history and year of inclusion. It is interpreted as the odds ratio of having a higher score than the present category.