Table 1

Subject characteristics and distribution of ED services and hospitalization utilization rates
Characteristics of study sample Utilization rate of ED services Hospitalization
Total Non-use Use Testing the consistency of distribution of subjects Non-use Use Testing the consistency of distribution of subjects
Subjects Rate (%) Subjects Rate (%) Subjects Rate (%) X2p value (Sig. level) Subjects Rate (%) Subjects Rate (%) X2p value (Sig. level)
Utilization rate of ED services Hospitalization
Total 280,840 100 266,817 100 14,023 100 220,856 100 59,984 100
Age
 ≤ 18 21,591 7.69 21,168 7.93 423 3.02 0.0000 * 19,611 8.88 1,980 3.3 0.00000 *
 18 ~ 64 148,015 52.7 142,738 53.5 5,277 37.63 122,522 55.48 25,493 42.5
 ≥ 65 111,234 39.61 102,911 38.57 8,323 59.35 78,723 35.64 32,511 54.2
Sex
 Male 127,387 45.36 120,173 45.04 7,214 51.44 0.0000 * 97,268 44.04 30,119 50.21 0.00000 *
 Female 153,453 54.64 146,644 54.96 6,809 48.56 123,588 55.96 29,865 49.79
Income status
 Non low-income 276,017 98.28 262,491 98.38 13,526 96.46 0.0000 * 217,750 98.59 58,267 97.14 0.00000 *
 Low-income 4,823 1.72 4,326 1.62 497 3.54 3,106 1.41 1,717 2.86
Disability status
 No 233,285 83.07 224,270 84.05 9,015 64.29 0.0000 * 191,523 86.72 41,762 69.62 0.00000 *
 Yes 47,555 16.93 42,547 15.95 5,008 35.71 29,333 13.28 18,222 30.38
Catastrophic illnesses
 No 235,420 83.83 225,759 84.61 9,661 68.89 0.0000 * 194,269 87.96 41,151 68.6 0.00000 *
 Yes 45,420 16.17 41,058 15.39 4,362 31.11 26,587 12.04 18,833 31.4
Charlson Comorbidity Index score
 0 90,919 32.37 89,451 33.53 1,468 10.47 0.0000 * 82,918 37.54 8,001 13.34 0.00000 *
 1 ~ 2 119,165 42.43 114,846 43.04 4,319 30.8 98,437 44.57 20,728 34.56
 ≥ 3 70,756 25.19 62,520 23.43 8,236 58.73 39,501 17.89 31,255 52.11
 2 208,663 74.3 199,887 74.92 8,776 62.58 0.0000 * 169,842 76.9 38,821 64.72 0.00000 *
 ≥ 3 72,177 25.7 66,930 25.09 5,247 37.42 51,014 23.1 21,163 35.28

Note: ‘*’ indicates statistical significance under P ≤ 0.001. ED: Emergency Department.

Chan et al.

Chan et al. BMC Health Services Research 2012 12:405   doi:10.1186/1472-6963-12-405

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