Jones A W
Forensic Sci Int. 1985 Aug;28(3-4):147-56. doi: 10.1016/0379-0738(85)90125-2.
A breath-alcohol screening device, Alcolmeter pocket model, was evaluated in a controlled field trial with policeman operating the instruments. The results of tests made with subjects before they drank alcohol were always zero. The standard deviation (S.D.) of breath alcohol determinations increased with increase in the concentration of alcohol in the sample, being 0.036 mg/ml at a mean blood-ethanol concentration of 0.53 mg/ml. The S.D. varied among subjects tested (from 0.022 to 0.053 mg/ml) as well as among the instruments used (from 0.023 to 0.054 mg/ml). The breath test results were on average less than the actual blood-ethanol concentrations when a 2100: 1 blood/breath ratio was used to calibrate the Alcolmeter device. Blood ethanol (x) and Alcolmeter readings (y) were highly correlated (r = 0.95 +/- 0.018) and the regression equation was y = -0.017 + 0.95x. At a mean blood-ethanol concentration of 0.50 mg/ml, the Alcolmeter instrument will indicate 0.46 mg/ml on average. The standard error estimate was 0.085 mg/ml, being 17% of the mean Alcolmeter reading and this corresponds to 95% confidence limits of +/- 0.17 mg/ml. The results of this study show that Alcolmeter pocket-model is a useful device for breath-alcohol screening purposes at a blood-alcohol level of 0.50 mg/ml. A blood/breath ratio of 2300 should be used to calibrate the Alcolmeter device.
一种呼气酒精筛查设备——便携式酒精测量仪，在一项由警察操作仪器的对照现场试验中进行了评估。对未饮酒受试者进行测试的结果始终为零。呼气酒精测定的标准差（S.D.）随着样本中酒精浓度的增加而增大，在平均血液乙醇浓度为0.53毫克/毫升时为0.036毫克/毫升。标准差在受试对象之间（从0.022至0.053毫克/毫升）以及所用仪器之间（从0.023至0.054毫克/毫升）存在差异。当采用2100:1的血/气比例来校准酒精测量仪设备时，呼气测试结果平均低于实际血液乙醇浓度。血液乙醇浓度（x）与酒精测量仪读数（y）高度相关（r = 0.95±0.018），回归方程为y = -0.017 + 0.95x。在平均血液乙醇浓度为0.50毫克/毫升时，酒精测量仪平均显示为0.46毫克/毫升。标准误差估计值为0.085毫克/毫升，占酒精测量仪平均读数的17%，这对应于±0.17毫克/毫升的95%置信区间。本研究结果表明，便携式酒精测量仪是一种在血液酒精水平为0.50毫克/毫升时用于呼气酒精筛查的有用设备。应采用2300的血/气比例来校准酒精测量仪设备。
