Table 2

Traumatic injury hospitalisation rates and trends, by severity and payer type

	Injury hospitalisation rates per 100 000 for the year 2009 (N)		Mean annual % change			Interaction by severity (severe trend/minor trend)
Sample	All	Severe	All	Severe	Minor	Trend ratio	95% CI	p Value
National (NHDS)
WC	20.5 (27 483)	7.6 (10 228)	↓3.4*	↑2.2^ns	↓6.4*	1.092	1.048 to 1.138	<0.001
Non-WC	332.0 (669 886)	161.3 (325 578)	↑0.1^ns	↑2.5*	↓1.6*	1.042	1.030 to 1.054	<0.001
Arizona
WC	26.4 (718)	8.5 (231)	↓1.4^ns	↑0.8^ns	↓2.3^ns	1.032	0.987 to 1.078	0.16
Non-WC	357.6 (14 975)	137.1 (5743)	↑0.04^ns	↑0.4^ns	↓0.2^ns	1.006	0.987 to 1.026	0.51
California
WC	21.9 (3405)	7.2 (1120)	↓6.7^ns	↓3.1*	↓8.2*	1.056	1.021 to 1.092	0.002
Non-WC	295.3 (70 900)	115.4 (27 707)	↓1.5*	↑0.5^ns	↓2.7*	1.033	1.020 to 1.046	<0.001
Colorado
WC	23.0 (559)	8.5 (207)	↓6.0*	↓3.3*	↓7.3*	1.043	1.025 to 1.061	<0.001
Non-WC	296.9 (9843)	135.3 (4485)	↓1.7*	↓0.2^ns	↓2.8*	1.026	1.018 to 1.034	<0.001
Florida
WC	28.5 (2204)	9.2 (711)	↓4.0*	↓2.6*	↓4.5*	1.020	1.002 to 1.038	0.03
Non-WC	324.9 (37 932)	136.1 (15 889)	↑0.7*	↑1.5*	↑0.1^ns	1.014	1.007 to 1.021	<0.001
Michigan
WC	25.8 (1054)	7.8 (318)	↓3.2*	↓0.7^ns	↓4.2*	1.037	1.020 to 1.055	<0.001
Non-WC	309.9 (20 074)	126.5 (8193)	↓0.3*	↑0.2^ns	↓0.7*	1.009	1.004 to 1.013	<0.001
New Jersey
WC	29.0 (1138)	8.1 (320)	↓4.9*	↓0.7^ns	↓6.1*	1.058	1.034 to 1.082	<0.001
Non-WC	269.1 (15 235)	96.2 (5447)	↓1.4*	↑1.5*	↓2.7*	1.043	1.033 to 1.054	<0.001
New York
WC	29.5 (2508)	8.2 (696)	↓2.8*	↓0.2^ns	↓3.6*	1.035	1.022 to 1.049	<0.001
Non-WC	259.7 (33 412)	87.4 (11 248)	↓1.6*	↑0.3^ns	↓2.4*	1.027	1.020 to 1.034	<0.001
South Carolina
WC	22.4 (402)	7.2 (129)	↓5.9*	↓3.5*	↓6.7*	1.035	1.014 to 1.056	0.001
Non-WC	291.1 (8315)	136.2 (3890)	↓0.9*	↑1.2*	↓2.3*	1.036	1.028 to 1.045	<0.001
Washington
WC	34.7 (1077)	12.0 (372)	↓0.8^ns	↑2.2*	↓2.0*	1.043	1.023 to 1.063	<0.001
Non-WC	248.7 (10 898)	99.8 (4373)	↑0.8*	↑1.8*	↑0.2^ns	1.015	1.006 to 1.024	0.002

*Statistically significant trend (trend not flat, at p≤0.05).
NHDS, National Hospital Discharge Survey; ns, not statistically significant; WC, workers’ compensation.