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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%