Association between Truck Crashes due to Mechanical Failure and Truck Age

Table 4

Estimated trucks from the quasi-induced exposure method.

Age	No. of nonfault trucks	% of nonfault trucks	Estimated number of trucks	Mechanical failures
0	2265	11.62	17,751,447	22
1	1778	9.13	13,934,690	17
2	1616	8.29	12,665,050	35
3	1251	6.42	9,804,442	15
4	1040	5.34	8,150,775	25
5	798	4.10	6,254,152	26
6	751	3.85	5,885,800	15
7	847	4.35	6,638,179	37
8	922	4.73	7,225,975	32
9	977	5.01	7,657,026	31
10	957	4.91	7,500,280	40
11	923	4.74	7,233,813	37
12	699	3.59	5,478,261	28
13	566	2.90	4,435,902	21
14	550	2.82	4,310,506	30
15	583	2.99	4,569,136	28
16	514	2.64	4,028,364	28
17	483	2.48	3,785,408	32
18	421	2.16	3,299,496	30
19	312	1.60	2,445,232	24
20	248	1.27	1,943,646	26
21	202	1.04	1,583,131	13
22	148	0.76	1,159,918	6
23	124	0.64	971,823	10
24	93	0.48	728,867	7
25	73	0.37	572,122	10
26	56	0.29	438,888	9
27	63	0.32	493,749	8
28	43	0.22	337,003	6
29	49	0.25	384,027	9
30	24	0.12	188,095	4
31	28	0.14	219,444	2
32	8	0.04	62,698	0
33	12	0.06	94,047	2
34	7	0.04	54,861	3
35	9	0.05	70,536	0
36	8	0.04	62,698	2
37	9	0.05	70,536	3
38	13	0.07	101,885	3
39	5	0.03	39,186	1
40	9	0.05	70,536	1
Sum	19,484	100.0	152,701,631	678