2.2 Measurement of participation in NSE health classes
In surveys of their NSE participation, the following question
was posed to the participants at baseline: “In the last year, how
many times did you participate in the following activities per
month on the average?” The participants chose their response
from four options: never; 1–2 times monthly; 3–4 times monthly; or
at least 5 times monthly. The response rates for the latter three
were as low as 14.5%, 3.8%, and 6.2%, respectively. Therefore, in
analysis, the responses were classified into two categories: never
and once a month or more.