Table 3 Baseline factors for the intervention and reference cities

Key factors	Guangzhou (intervention)		Nanning (reference)
Key factors	No	Prevalence(%)	No	Prevalence(%)
Driver seat belt use by road type
Local roads	5743	45	7516	60
Main roads	4842	44	8301	66
Expressways	6447	63	1145	86
Driver seat belt use by gender
Male	16208	50	15479	64
Female	811	58	1481	63
Driver seat belt use by time
Week day	4637	51	4987	70
Week night	4122	49	3984	62
Weekend day	4603	52	4290	64
Weekend night	3670	48	3701	58
Driver seat belt use by vehicle type
Car	12679	61	10234	68
Taxi	3112	30	5816	60
Other	1224	40	893	46
Passenger seat belt use by road type
Local roads	1364	31	1376	32
Main roads	1470	33	1542	37
Expressways	2801	51	612	68
Passenger seat belt use by gender
Male	3652	39	2384	39
Female	1951	41	1144	35
Passenger seat belt use by time
Week day	1437	40	983	42
Week night	1241	38	839	37
Weekend day	1715	43	898	38
Weekend night	1242	38	810	34
Passenger seat belt use by vehicle type
Car	4411	46	2761	45
Taxi	800	26	561	24
Other	416	26	199	24