Validity of instruments to assess students' travel and pedestrian safety

BMC Public Health

Table 4 Agreement, sensitivity and specificity at the item level for the pedestrian safety behavior checklist.

Item	Correct		Sensitivity^a	Specificity^b
	n	%
1. Student is part of a walking school bus	290	100	n/a	1.00
2. Crossed at corner or at a crosswalk	269	94	0.95	0.83
3. Crossed with adult or with the safety patrol	272	95	0.95	n/a
4. Stopped at the curb	245	85	0.72	0.89
5. Looked left-right-left	281	98	n/a	0.98
6. Kept looking while crossing	196	68	0.73	0.48
7. Walked (did not run) across the street	258	90	0.91	0.83
8. Waited or followed the traffic signal (if there is one)	290	100	n/a	1.00
Total	2101	91	0.85	0.83

a. Sensitivity could not be assessed for the behaviors (#1, #5, and #8) that none of the children performed.
b. Specificity could not be assessed for the behavior (#3) that all of the children performed.

ISSN: 1471-2458