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Table 1 Characteristics of elementary school students from grade 7 by different cohorts

From: Fitness, fatness, and academic performance in seventh-grade elementary school students

 

Cohort 1

Cohort 2

Cohort 3

Total

n (%)

n (%)

n (%)

n (%)

Gender

    

 Male

184 (51.3)

215 (50.7)

388 (51.9)

787 (51.4)

 Female

175 (48.7)

209 (49.3)

360 (48.1)

744 (48.6)

Weight status

    

 Obesity

24 (7.1)

29 (7.1)

57 (7.6)

110 (7.4)

 Overweight

71 (21.0)

101 (24.6)

164 (22.3)

336 (22.7)

 Normal weight

243 (67.7)

280 (68.3)

513 (69.9)

1036 (69.9)

Cardiorespiratory fitness

    

 Unfit

101 (28.1)

119 (28.1)

166 (22.2)

386 (19.9)

 Fit

258 (71.9)

305 (71.9)

582 (77.8)

1145 (74.8)

Cardiorespiratory fitness/weight status

    

 Unfit/overweight

46 (12.7)

56 (13.2)

71 (9.5)

173 (11.3)

 Unfit/normal weight

56 (15.7)

60 (14.2)

94 (12.5)

210 (13.7)

 Fit/overweight

55 (15.4)

78 (18.5)

154 (20.6)

288 (18.8)

 Fit/normal weight

202 (56.2)

229 (54.1)

405 (57.4)

860 (56.2)

Mathematics

    

 Low achievement

70 (19.5)

113 (26.7)

187 (25.0)

370 (24.2)

 Average achievement

172 (47.9)

210 (49.5)

289 (38.6)

671 (43.8)

 High achievement

117 (32.6)

101 (23.8)

272 (36.4)

490 (32.0)

Portuguese language

    

 Low achievement

40 (11.1)

52 (12.3)

115 (15.4)

207 (13.5)

 Average achievement

208 (57.9)

259 (61.1)

351 (46.9)

818 (53.4)

 High achievement

111 (30.9)

113 (26.7)

282 (37.7)

506 (33.1)

Foreign language (English)

    

 Low achievement

54 (15.0)

76 (17.9)

118 (15.8)

248 (16.2)

 Average achievement

159 (44.3)

230 (54.2)

333 (44.5)

722 (47.2)

 High achievement

146 (40.7)

118 (27.8)

297 (39.7)

561 (36.6)

Sciences

    

 Low achievement

31 (8.6)

62 (14.6)

107 (14.3)

200 (13.1)

 Average achievement

183 (51.0)

247 (58.3)

339 (45.3)

769 (50.2)

 High achievement

145 (40.4)

115 (27.1)

302 (40.4)

562 (36.7)

Overall academic achievement

    

 Low achievement

60 (16.7)

91 (21.5)

146 (19.5)

297 (19.4)

 Average achievement

213 (59.3)

267 (63.0)

392 (52.4)

872 (57.0)

 High achievement

86 (24.0)

66 (15.6)

210 (28.1)

362 (23.6)

  1. Cohort 1 started the study in grade 5, and these data were collected in 2011.
  2. Cohort 2 started the study in grade 6, and these data were collected in 2010.
  3. Cohort 3 started the study in grade 7, and these data were collected in 2009.