. 2019 Jul 5;14(7):e0219087. doi: 10.1371/journal.pone.0219087

Table 2. Description of psychomotor vigilance task test outcome measures (female employees of University Hospital Bergmannsheil, Bochum, working night and day shifts).

	Day shift	Night shift	p-value^*
Study days (n)
1^st day	71	71
2^nd day	71	71
3^rd day	-	64
*Psychomotor vigilance task outcomes*	*Mean (SD)*	*Mean (SD)*
Mean reaction time [ms]
Total	234.87 (20.23)	241.74 (23.49)	<0.0001
1^st day	235.99 (19.97)	243.81 (23.69)	0.0002
2^nd day	233.74 (20.56)	241.13 (23.15)	<0.0001
3^rd day	n/a	240.13 (23.82)
Mean slowest 10% reaction time [ms]
1^st day	317.64 (19.99)	322.94 (20.78)	0.009
2^nd day	313.69 (20.68)	318.94 (20.61)	0.009
3^rd day	n/a	319.37(23.28)
Mean fastest 10% reaction time [ms]
1^st day	184.47 (18.02)	190.98 (21.24)	0.003
2^nd day	183.84 (18.87)	191.06 (19.51)	<0.0001
3^rd day	n/a	186.94 (19.95)5.28 (4.98, 5.86)
*Psychomotor vigilance task outcomes*	%	%
Lapses (reaction time ≥355ms) [%]
1^st day	6.44 (4.62)	9.01 (10.53)	0.0728
2^nd day	6.08 (5.35)	9.19 (9.09)	0.0003
3^rd day	n/a	7.83 (8.04)
False starts (reaction time <100ms) [%]
1^st day	2.94 (4.81)	3.25 (7.26)	0.3259
2^nd day	2.92 (7.75)	2.91 (5.57)	0.4290
3^rd day	n/a	3.06 (5.21)
Reaction time coefficient of variation (RTCV)^†
1^st day	28.70 (9.51)	28.27 (14.19)	0.2056
2^nd day	28.06 (14.80)	28.68 (11.05)	0.7439
3^rd day	n/a	28.66 (11.04)
Throughput^‡
1^st day	229.91 (33.25)	216.12 (45.09)	0.0009
2^nd day	233.70 (36.81)	217.30 (46.76)	<0.0001
3^rd day	n/a	223.25 (46.08)

SD, standard deviation

† RTCV = $[\frac{S D (r e a c t i o n t i m e a l l s t i m u l i)}{m e a n (r e a c t i o n t i m e a l l s t i m u l i)}] * 100$

‡ Throughput = [ $\frac{N c o r r e c t r e s p o n s e s}{C u m u l a t i v e r e a c t i o n t i m e s (f a l s e a n d c o r r e c t)}$ ]

*p-values for differences between day and night shifts from paired t-test for reaction time, RCTV, and throughput and from Wilcoxon signed-rank test for error percentages