Table 5

**Duration of absence and recurrence of symptoms by collision-related factors**
	Duration of absence (n=2810)				Recurrence of symptom (n=1666)
	N	Mean	S.D.	P-value	N	Rate	P-value
Multiple injuries
Yes	1259	93.8	189.9	0.016	---	---	---
No	1551	72.7	112.6	0.016	---	---	---
Collision severity
Fatal or serious	345	133.5	268.2	0.0001	128	10.2	0.13
Other	2465	74.9	126.7	0.0001	1538	6.6	0.13
Vehicle type
Car or taxi	2492	79.6	149.4	0.011	1529	6.9	0.85
Other	318	102.3	174.1	0.011	137	7.3	0.85
Function of subject
Driver	2127	78.7	142.6	0.56	1303	7.2	0.34
Other	683	92.7	179.6	0.56	363	5.8	0.34
Collision with
Moving object	2199	81.9	146.6	0.95	1406	7.0	0.80
Other	611	82.9	172.3	0.95	260	6.5	0.80
Number of vehicles
One only	664	89.4	176.5	0.20	286	6.3	0.66
Other	2146	79.9	144.2	0.20	1380	7.0	0.66
Direction of collision
Rear-end	850	73.9	131.5	0.001	658	8.7	0.02
Other*	1960	85.7	106.6	0.001	1008	5.8	0.02
Seat belt use
Yes*	2560	81.2	155.5	0.01	1576	7.0	0.34
No	250	91.8	117.8	0.01	90	4.4	0.34
Speed limit
- than 60	1509	76.0	131.9	0.23	983	6.9	0.98
60 and +	1301	89.3	173.2	0.23	683	6.9	0.98