Table 2.

Neuropsychological mean scores of control and insomnia subgroups

	Controls ≥ 6h (n= 343)	Insomniacs ≥ 6h (n= 65)	Controls < 6h (n = 219)	Insomniacs < 6h (n = 51)	F Interaction	F Insomnia	F Short sleep duration
Symbol Digit Modalities Test
Number Correcta	50.64 ± 8.90	52.39 ± 9.19	48.58 ± 9.03	46.26 ± 8.93	5.00*	0.07	16.69**
Trail Making Test
TMT-A, secondsa	31.53 ± 10.93	32.02 ± 11.37	31.12 ± 11.25	33.21 ± 11.00	0.52	1.19	0.11
TMT-B, secondsa	75.18 ± 33.52	68.03 ± 34.59	77.48 ± 34.04	87.83 ± 33.49	6.59**	0.12	8.08**
TMT B–A, secondsa	43.65 ± 29.45	36.01 ± 30.47	46.36 ± 30.04	54.61 ± 29.42	7.03**	0.00	9.67**
Benton Visual Retention Test
Number Correcta	6.79 ± 1.67	6.85 ± 1.69	6.64 ± 1.63	6.27 ± 1.64	0.01	1.88	3.07
Number of Errorsa	4.76 ± 2.78	5.20 ± 2.82	5.13 ± 2.81	5.72 ± 2.71	3.39	0.85	4.45*
Omissionsa	0.40 ± 0.93	0.44 ± 0.97	0.38 ± 0.89	0.75 ± 0.93	4.33*	1.77	4.22*
Distortionsa	2.14 ± 1.67	2.27 ± 1.77	2.41 ± 1.78	2.28 ± 1.71	0.91	0.04	0.26
Perseverationsa	0.69 ± 0.93	0.72 ± 1.05	0.75 ± 0.89	0.81 ± 0.93	0.41	0.35	0.02
Rotationsa	0.76 ± 0.93	0.84 ± 0.97	0.70 ± 0.89	1.00 ± 0.86	0.99	1.25	0.13
Misplacementsa	0.68 ± 0.93	0.69 ± 0.97	0.78 ± 1.04	0.86 ± 1.00	0.01	0.17	1.40
Size errora	0.10 ± 0.37	0.14 ± 0.48	0.12 ± 0.44	0.10 ± 0.43	0.34	0.08	0.21
Thurstone Word Fluency Test
Oral, number of wordsa	11.65 ± 4.26	12.19 ± 4.35	11.67 ± 4.29	12.15 ± 4.21	0.00	1.34	0.01
Written, number of wordsa	11.56 ± 3.70	12.09 ± 3.87	11.75 ± 3.85	11.31 ± 3.71	1.91	0.02	0.54

^avalues are mean ± SD adjusted for age, education, gender, race, BMI, physical health, mental health, and sampling weight;

^*P < 0.05,

^**P < 0.01