2-2-3. Productivity
We use two indices of productivity, Respondents were asked to answer each of these questions on a 10-point Likert scale, with higher numbers indicating a greater frequency. Responses to these 15 items are transformed into a composite variable, As the second productivity index, we use presenteeism data based on the As in The number of participants who responded to both baseline and follow-up WLQ surveys was 114 in the treatment group and 39 in the control group. Using these samples, we also conducted tests of the difference in composition as well as 