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They declared mean work week duration of 66 hours.
They had a mean employment duration of 13.6 months (SD = 5.7 months), and 74 (23.2%) of them wore contact lens at work on a regular basis.
The mean study duration was 18 weeks.
Workers were divided into three groups: Group 1: MMA-exposed workers (n = 68, mean age 38.6 years, work duration 12.1 years); Group 2: mechanics (n = 80, mean age 47.4 years, work duration 22.3 years); and Group 3: control group consisting of all other employees (n = 632, mean age 43.5 years, work duration 17.3 years).
"I mean work.
To summarize data, we used descriptive statistics to calculate the means of the continuous variables age, working duration (in years), BMI, blood lead levels, and bone lead levels.
Mean duration of work in years was 12.1 ± 9.0 (range 1 - 44, median 10).
The average age and the mean duration of work tenure were 34 and 8.5 years, respectively.
Mean duration of working with HIV patients = 21.6 years (range 5 34).
There were 43 healthcare workers of 13 study sites contributing to this study, 17 females and 26 males (female/male 1/1.5), with a mean (range) age of 36.7 years (26 56 years) and a mean (range) duration of working experience of 12.7 years (1 – 35 years).
Among 31,265 participants who indicated to have ever worked nights and who provided period-specific information, the mean lifetime duration of night shift work was 11.9 years (SD 8.4 years); 20% had worked at least 1 night per month for 20 years or more.
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