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Table 2 Number of participants and percentage of females in each grade and survey year

From: Back pain in children surveyed with weekly text messages - a 2.5 year prospective school cohort study

School grade in survey year 1 Participants in survey year 1 Participants in survey year 2 Participants in survey year 3
N % girls N % girls N % girls
0 133 56% 207 53% 206 55%
1 160 55% 236 55% 237 54%
2 157 46% 251 46% 259 46%
3 155 51% 233 55% 233 55%
4 160 58% 237 62% 236 55%
Total/Mean 765 53% 1164 53% 1171 53%