Table 4.

Comparison of the groups on Berg’s Card Sorting Task (BCST) and Continuous Performance Task (CPT).

Variables	Shift workers (n = 30)		Day workers (n = 30)		T-Value	P
	Mean	S.D.	Mean	S.D.
BCST
Perseverative error	29.70	11.23	23.40	8.03	2.49	0.015*
Completed categories	4.40	2.343	5.57	2.09	–2.03	0.047*
CPT
Omission error	9.20	9.15	5.20	4.36	2.15	0.037*
Commission error	18.60	7.25	14.83	6.67	2.09	0.041*
Reaction time	397.55	50.05	404.68	44.33	–.0.58	0.561

Note: * p < 0.05