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. 2022 Feb 10;17(2):e0263645. doi: 10.1371/journal.pone.0263645

Table 1. Descriptive statistics of study participants.

Elementary School Middle School Total
4th 5th 6th 7th 8th 9th
Gender Male 260 248 265 304 271 288 1636
Female 259 263 248 258 286 267 1581
Total(by grade) 519 511 513 562 557 555 3217
Total(by school) 1543 1674