Table 2. Characteristics of Cases and Controls .

Variables	Control a (n = 1141)	Case a (n = 185)	OR (Crude) a (95% CI)	P Value
Age (y), mean, SD (range)	58.6, 17.2 (57.6-59.6)	52.9, 18.5 (50.2-55.6)	0.99 (0.98 to 1.00)	.069
Gender
Male, No. (%)	630.0 (55%)	106.0 (57)	0.98 (0.72 to 1.34)	.901
Female, No. (%)	511.0 (45%)	79.0 (43)
Mean 'Morse Falls Scale Score', mean, SD (range)	60.4, 15.8 (59.4-61.3)	47.4, 19.0 (44.6-50.1)	0.93 (0.93 to 0.95)	<.001
Fall history (3 mounts ago), No. (%)	171.0 (14%)	42.0 (22.7%)	0.48 (0.32 to 0.73)	<.001
Mean length of stay, days, mean, SD (range)	10.2, 12.8 (7.2-8. 4)	13.84, 14.3 (11.8-15.9)	1.01 (1.00 to 1.02)	<.001

Abbreviations: OR, odds ratio; SD, standard deviation.

^aThe estimates accompanied with 95% CI in the parenthesis‏ based on multilevel logistic regression.