Table 1:

Clinical variables of patients in different stages of CO exposure^{^a}

	CO-Exposure Group (n = 17)			Controls (n = 30)
	Acute Stage	DNS Stage	Chronic Stage	Controls (n = 30)
Average days to evaluation	5.53 ± 1.07	30.76 ± 5.90	196.41 ± 9.21
Sex (male/female) (No.)	8:9	8:9	8:9	15:15
Age (yr)	47.41 ± 11.50	47.41 ± 11.50	47.41 ± 11.50	48.40 ± 9.84
Education (yr)	14.00 (9.50 ± 14.00)	14.00 (9.50 ± 14.00)	14.00 (9.50 ± 14.00)	14.00 (11.00 ± 14.00)
MMSE	26.00 ± 2.50^{^b,^c}	18.59 ± 4.21^{^c,^d}	24.59 ± 2.81^{^c}	29.00 (28.00–29.00)
Barthel Index	90.00 (80.00–100.00)^{^b,^c}	25.00 (16.00–45.00)^{^c,^d}	98.00 (92.50–100.00)^{^c}	100.00 (100.00-100.00)
Digit span test
Forward	6.00 ± 1.46^{^b,^c}	2.00 (1.50–3.00)^{^c,^d}	5.06 ± 1.98^{^c}	7.00 (7.00–8.00)
Backward	3.76 ± 1.25^{^b,^c}	1.00 (1.00–1.00)^{^c,^d}	2.41 ± 0.94^{^c}	5.00 (4.00–5.00)
Verbal fluency test
Animals	11.18 ± 3.36^{^b,^c}	5.47 ± 2.90^{^c,^d}	9.53 ± 3.15^{^c}	15.00 (14.75.00–16.00)
Vegetables	11.59 ± 2.29^{^b,^c}	5.00 (3.50–6.00)^{^c,^d}	11.00 (9.50–12.00)^{^c}	13.87 ± 1.50

Note:—MMSE indicates Mini-Mental State Examination.
↵a Data are expressed as mean ± SD and median (25th to 75th quartiles).
↵b P < .05 (acute versus DNS).
↵c P < .05 (versus controls).
↵d P < .05 (DNS versus chronic).