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Table 2 Age, sex, operations, ICU admission, using devices and chronic diseases of the subjects with and without HAI in univariate analysis, category variables, aged 60+, in Beijing, China (As a retrospetive study, there were some missing values about chronic diseases)

From: Risk factors of health care–associated infection in elderly patients: a retrospective cohort study performed at a tertiary hospital in China

Variables No. of subjects No. of HAIs Incidence (%) χ 2 P
Age 60~69y 32156 637 1.98 241.76 < 0.001
70~79y 18203 462 2.54
≥80y 9973 481 4.82
Sex Male 33280 909 2.73 3.69 0.06
Female 27052 671 2.48
Operation No 32627 947 2.90 22.42 < 0.001
Yes 27705 633 2.28
ICU days d = 0 51980 911 1.75 3625.18 < 0.001
d < 2 1742 46 2.64
2 ≤ d < 7 4120 159 3.86
7 ≤ d < 14 1472 154 10.46
d ≥ 14 1018 310 30.45
Using ventilator No 58478 1191 2.04 2529.06 < 0.001
Yes 1854 389 2.10
Using central line catheter No 56338 1015 1.80 2228.59 < 0.001
Yes 3994 565 14.15
Using urinary catheter No 43956 626 1.42 906.33 < 0.001
Yes 16376 954 5.82
Cerebral hemorrhage No 56866 1359 2.39 122.02 < 0.001
Yes 2770 160 5.78
Cerebral infarction No 39857 871 2.19 63.38 < 0.001
Yes 19779 648 3.28
Brain neoplasms No 59192 1496 2.53 12.49 < 0.001
Yes 444 23 5.18
Hypertension No 25586 590 2.31 10.50 < 0.001
Yes 34050 929 2.73
Hyperlipidemia No 51189 1330 2.60 3.84 0.05
Yes 8453 189 2.23
Diabetes mellitus No 40751 985 2.42 8.76 < 0.001
Yes 18885 534 2.83
Coronary artery disease No 41284 825 2.00 162.76 < 0.001
Yes 18352 694 3.78
COPD No 57510 1438 2.50 14.16 < 0.001
Yes 2126 81 3.81
Malignant tumor No 49227 1203 2.44 12.13 < 0.001
Yes 10409 316 3.04
Malignant hematonosis No 57123 1229 2.15 854.76 < 0.001
Yes 2513 290 11.53
Osteoarthropathy No 56429 1435 2.54 0.07 0.79
Yes 3207 84 2.62
Gynecological diseases No 58860 1510 2.56 6.10 0.020
Yes 776 9 1.16