TABLE 2.

National Estimates of Sleeplessness-Related Complaints, Diagnoses, and Prescriptions for Benzodiazepine and Nonbenzodiazepine Sedative Hypnotics as a Result of Physician Office Visits, by Age Group: United States, 1993–2007

	Sleeplessness as Reason for Office Visit, Complaints Per 10 000 Visits			Insomnia Diagnoses, Per 10 000 Visits			BDZ Prescriptions, Per 10 000 Visits			NBSH Prescriptions, Per 10 000 Visits
Years	18–44 Years	45–64 Years	≥ 65 Years	18–44 Years	45–64 Years	≥ 65 Years	18–44 Years	45–64 Years	≥ 65 Years	18–44 Years	45–64 Years	≥ 65 Years
1993–1995	48.3	55.5	51.7	16.1	25.6	21.9	21.9	34.1	63.6	11.9	17.8	18.1
1996–1998	47.9	67.1	59.9	30.1	37.1	44.0	13.7	37.1	49.3	17.8	42.4	37.0
1999–2001	79.8	71.5	67.6	39.2	44.1	38.7	32.2	36.5	45.1	37.8	79.1	43.5
2002–2004	69.5	85.1	40.8	47.7	57.6	29.2	27.3	32.7	42.3	60.0	110.0	91.9
2005–2007	69.0	81.4	57.1	73.1	71.6	53.0	28.4	46.1	63.9	143.5	228.3	159.0
Model statisticsa
Slope, b	2.10	2.33	−0.28	4.40	3.75	1.58	0.93	0.68	−0.16	10.63	16.95	11.69
Correlation, r	0.70	0.93	−0.13	0.98	0.99	0.61	0.60	0.60	−0.07	0.91	0.95	0.95

Note. BDZ = benzodiazepine; NBSH = nonbenzodiazepine sedative hypnotic.

^aFor model statistics, b is the slope from bivariate regression of variable on year-range midpoint.; r is the temporal correlation of variable with year-range midpoint. Ranges are 3 years except for the first year range for NBSH which is 2 years (1994-1995), because NBSH was not coded in 1993.