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对 ５５ 名锰粉加工工人和 ５６ 名对照工人的调查结果显示，工人工作地点 Ｍｎ Ｏ２ 浓度几何均值为 １９６ ｍ ｇ／ｍ ３ （锰尘 ０１７～２２．２４ ｍ ｇ／ｍ ３ ），样品超标率 ８８７％ 。接触组头晕头痛、睡眠障碍、容易疲劳和记忆不良的主诉率明显高于对照组（ Ｐ＜００５～００１）。接触组和对照组的心电图异常、高血压和低舒张压检出率未见显著性差异，其心率、 Ｐ Ｒ间期、 Ｑ Ｒ Ｓ波、收缩压和舒张压的均值比较也没有显著性差异。接触组心电图异常和低舒张压的 Ｏ Ｒ分别是 １．５６（９５％ 可信区间为 ０７０～３．５０）和 ２．０８（９５％ 可信区间为 ０１８～２３．５７）。
According to the survey results of 55 manganese workers and 56 control workers, the geometrical mean value of Mn O2 concentration at working place of workers is 196 m g / m 3 (manganese dust 017 ~ 22.24 m g / m 3) , The sample exceeded the standard rate of 88 7%. The prevalence rate of dizziness, headache, sleep disorders, fatigue and poor memory in the contact group was significantly higher than that in the control group (P <005-001). Electrocardiogram abnormalities in the contact group and the control group, no significant difference in the detection rate of hypertension and low diastolic blood pressure, heart rate, P R interval, Q R S wave, mean systolic and diastolic blood pressure was no significant difference difference. The O R of electrocardiogram anomalies and low diastolic blood pressure in the exposure group were 1.56 (95% confidence interval, 070-3.50) and 2.08 (95% confidence interval, 018-23.57) .