Table 2.

Estimates of precision: Percent of non-representative samples out of 1,000 samples.

Characteristic	Sampling Method and Sample Size
	True Random	Random 4-Hour Time Block by number of blocks	Random 4-Hour Time Block by exact sample size	Business Hour
	n = 200	n ≈ 200	n = 200	n = 200
Age	4.4	11.0	10.4	12.0
Sex	4.2	5.2	5.2	3.6
Race	4.9	8.3	9.4	4.3
Language	4.2	5.8	6.8	5.0
Triage acuity	4.6	10.5	10.3	7.1
Disposition	6.6	21.4	22.2	7.9
Mode of
arrival	4.8	11.3	10.4	5.3
Payer source	4.9	7.3	9.7	9.6

Bolded numbers refer to the percent of samples that were statistically different from the expected 5.0 percent