Table 5

Estimated helmet use rate among motorcyclists in each city/county and absolute inequality (between-group variance, BGV), relative inequality (rate ratio between the highest and lowest regions or between the east and north regions) and percentage change between 2002 and 2008 in Taiwan

	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	Change
Whole of Taiwan	45	72	77	82	89	93	91	91	90	89	89	88	−11
North	56	87	81	89	94	96	96	95	94	91	89	86	−18
Taipei City	64	93	95	98	99	99	99	98	97	98	97	97	−3
Hsinchu City	24	41	52	60	79	88	90	88	90	87	84	70	−75
Keelung City	37	67	85	89	91	95	88	89	92	94	97	93	−5
Taipei County	38	67	79	85	93	97	98	98	95	87	81	75	−58
Taoyuan County	41	65	75	84	92	94	93	92	93	91	93	95	1
Hsinchu County	27	34	57	64	77	84	87	86	85	84	83	87	10
Yilan County	29	59	65	75	81	91	90	91	92	93	94	96	15
Middle	31	55	69	73	85	90	91	90	90	90	90	87	−9
Taichung City	35	56	72	79	92	97	98	98	98	98	98	98	5
Miaoli County	18	69	52	65	77	84	80	72	77	76	78	79	−27
Taichung County	33	55	63	74	92	96	95	94	95	92	96	93	−10
Changhua County	19	29	57	70	84	92	93	95	94	93	91	86	−32
Nantou County	16	43	48	52	72	87	90	81	76	81	87	84	−15
Yunlin County	22	22	33	62	65	74	68	65	61	61	57	56	−82
South	42	71	81	81	87	92	88	87	87	87	88	89	−7
Kaohsiung City	44	70	72	83	89	92	89	89	93	96	97	97	11
Chiayi City	17	80	93	97	98	98	99	100	99	99	97	90	−46
Tainan City	42	76	85	88	94	97	93	92	94	93	94	95	−4
Chiayi County	41	36	46	73	76	88	82	80	83	81	80	82	−14
Tainan County	25	41	66	67	81	90	88	87	85	86	88	90	−2
Kaohsiung County	28	41	40	59	79	89	85	84	81	76	77	80	−33
Pingtung County	31	53	41	53	76	88	86	83	81	80	81	80	−27
East	31	59	74	82	88	89	91	90	90	89	91	94	16
Hualien County	27	64	84	87	92	93	98	94	93	91	93	96	9
Taitung County	45	51	58	72	86	85	86	86	85	87	90	91	13
Inequality
BGV	169	221	149	168	78	31	48	58	66	69	78	95
Highest/lowest	4.10	4.21	2.84	1.87	1.52	1.34	1.46	1.54	1.64	1.64	1.71	1.76
East/North	0.56	0.68	0.91	0.93	0.94	0.92	0.95	0.95	0.95	0.98	1.03	1.08