Association between Truck Crashes due to Mechanical Failure and Truck Age

Table 3

Chi-square test with the contingency table.

Classification	0–9 years	10–19 years	20–29 years	30–40 years	Sum
Nonfault	12,245	6,008	1,099	132	19,484
Mechanical failures	255	298	104	21	678
Sum	12,500	6,306	1,203	153	20,162
Percentage of the mechanical failures	2.0%	4.7%	8.6%	13.7%	3.4%
Chi-square test	256.19906 ( < 0.0001)