Fitness for duty prediction model for bus driver of batik solo trans based on physical, mental, and work aspects

Figures & data

Figure 1. Research flowchart.

Figure 2. The average of PVT value.

Table 1. The normality test of PVT

Category		Shapiro-Wilk			Criteria	Information
		Statistic	df	Sig.
PVT	In the morning before work	0,899	18	0,055	0,05	Normal
	In the morning after work	0,925	18	0,161		Normal
	At noon before work	0,885	12	0,102		Normal
	At noon after work	0,895	12	0,138		Normal

Table

H0 =	the average condition of the attention of the morning shift and afternoon shift drivers is not significantly different
H1 =	the average condition of the attention of the morning shift and afternoon shift drivers is significantly different

Table 2. PVT independent sample T-test results on morning and afternoon shifts

		Levene’s Test for Equality of Variances		t-test for Equality of Means
		F	Sig.	t		Sig. (2-tailed)
PVT Before work	Equal variances assumed	2,576	0,120	−0,222		0,826
	Equal variances not assumed			−0,255		0,801

Figure 3. The average of VAS value.

Table

H0 =	average condition of driver fatigue level morning shift and afternoon shift are not significantly different significant
H1 =	average condition of driver fatigue level morning shift and afternoon shift are different significant

Figure 4. Average of KSS value.

Table

H0 =	average condition of the driver’s level of sleepiness during morning and afternoon shifts are not significantly different
H1 =	average condition of the driver’s level of sleepiness during morning and afternoon shifts are significantly different

Table 3. VAS normality test

Category		Shapiro-Wilk			Criteria	Information
		Statistic	df	Sig.
VAS	In the morning before work	0,802	18	0,002	0,05	Normal
	In the morning after work	0,919	18	0,124		Abnormal
	At noon before work	0,753	12	0,003		Normal
	At noon after work	0,903	12	0,172		Abnormal

Table 4. Results of Mann Whitney U test VAS driver for morning shift and afternoon shift

VAS Morning Shift—Afternoon Shift
Z	−0,477
Asymp. Sig. (2-tailed)	0,633

Table 5. KKS normality test

Category		Shapiro-Wilk			Criteria		Information
		Statistic	df	Sig.
KSS	In the morning before work	0,614	18	0,000	0,05		Normal
	In the morning after work	0,856	18	0,010			Normal
	At noon before work	0,852	12	0,039			Normal
	At noon after work	0,960	12	0,777			Abnormal

Table 6. Results of Mann Whitney U on the KSS test for morning shift and afternoon shift drivers

KSS Morning Shift—Afternoon Shift
Z	−0,847
Asymp. Sig. (2-tailed)	0,397

Table 7. Correlations result

		Age	Weight	Height	Sleep Duration	Sleep Quality	Cigarette Consumption	Caffeine Consumption	Shift	Change in PVT value	Change in VAS value	Change in KSS value	Fit
Spearman’s rho	Age	1,000	0,177	0,136	.374*	0,002	−0,049	0,347	−0,095	−0,100	0,186	0,120	−.441*
	Weight	0,177	1,000	0,277	−0,295	.442*	−0,299	0,187	−.390*	0,006	−.461*	0,185	0,131
	Height	0,136	0,277	1,000	0,093	0,307	0,017	0,047	0,087	0,060	−.450*	0,234	0,004
	Sleep Duration	.374*	−0,295	0,093	1,000	−0,335	0,220	−0,032	.480**	−0,204	0,107	−0,134	−0,199
	Sleep Quality	0,002	.442*	0,307	−0,335	1,000	−0,205	−0,037	−.528**	0,272	−0,170	−0,016	0,138
	Cigarette Consumption	−0,049	−0,299	0,017	0,220	−0,205	1,000	−0,126	0,289	.368*	0,272	−0,180	−0,267
	Caffeine Consumption	0,347	0,187	0,047	−0,032	−0,037	−0,126	1,000	0,000	−.367*	−0,016	0,281	−0,067
	Shift	−0,095	−.390*	0,087	.480**	−.528**	0,289	0,000	1,000	0,039	−0,089	0,157	0,031
	Change in PVT value	−0,100	0,006	0,060	−0,204	0,272	.368*	−.367*	0,039	1,000	0,067	−0,152	−0,052
	Change in VAS value	0,186	−.461*	−.450*	0,107	−0,170	0,272	−0,016	−0,089	0,067	1,000	−.388*	−.571**
	Change in KSS value	0,120	0,185	0,234	−0,134	−0,016	−0,180	0,281	0,157	−0,152	−.388*	1,000	.541**
	Fit	−.441*	0,131	0,004	−0,199	0,138	−0,267	−0,067	0,031	−0,052	−.571**	.541**	1,000

Table 8. Coefficient of determination

Step	−2 Log-likelihood	Cox & Snell R Square	Nagelkerke R Square
1	15.936^a	.467	.680

Table 9. Hosmer and lemeshow test

Step	Chi-square	Df	Sig.
1	4.980	8	.760

Table 10. Classification matrix

Observed			Predicted
			FFD		Percentage Correct
			NOT FIT	FIT
Step 1	FFD	NOT FIT	6	2	75.0
		FIT	2	20	90.9
	Overall Percentage				86.7

Table 11. Regression test results

Variable in The Question			B
tep 1^a	X1	Age	−.674
	X2	Weight	.299
	X3	Height	.133
	X4	Sleep Duration	.320
	X5	Sleep Quality	−1.699
	X6	Cigarette Consumption	5.695
	X7	Caffeine Consumption	−1.735
	X8	Shift	2.048
	X9	PVT Value	.023
	X10	VAS Value	1.300
	X11	KSS Value	3.338
	Constant		−13.991