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. 2021 Aug 26;4(8):e2121675. doi: 10.1001/jamanetworkopen.2021.21675

Table 1. Characteristics for the Sample Overall and by Sex and Sports Club Membership.

Characteristic September 2019 June 2020 September 2020
6-min Run, mean (SD), m
All (n = 763) 917.0 (141.0) ND 815.0 (134.3)
Sports club membership 966.8 (131.9) ND 860.0 (135.6)
No sports club membership 880.9 (136.5) ND 782.2 (123.4)
Girls
All 871.2 (121.4) ND 777.4 (118.7)
Sports club membership 900.9 (113.4) ND 797.0 (127.8)
No sports club membership 857.8 (122.8) ND 768.6 (113.6)
Boys
All 963.1 (144.5) ND 852.8 (138.4)
Sports club membership 1005.5 (126.7) ND 897.0 (126.4)
No sports club membership 915.0 (148.6) ND 802.4 (134.6)
6-min Run SD score, mean (SD)
All (n = 763) 0.49 (1.13) ND −0.57 (0.97)
Sports club membership 0.83 (1.05) ND −0.29 (0.97)
No sports club membership 0.24 (1.12) ND −0.78 (0.92)
Girls
All 0.40 (1.08) ND −0.64 (0.96)
Sports club membership 0.67 (1.00) ND −0.48 (1.02)
No sports club membership 0.28 (1.09) ND −0.71 (0.92)
Boys
All 0.58 (1.17) ND −0.50 (0.98)
Sports club membership 0.93 (1.06) ND −0.18 (0.92)
No sports club membership 0.19 (1.17) ND −0.88 (0.91)
BMI SD score, mean (SD)
All (n = 764) 0.37 (1.08) 0.49 (1.10) 0.53 (1.10)
Sports club membership 0.26 (0.96) 0.36 (1.01) 0.40 (1.00)
No sports club membership 0.44 (1.16) 0.59 (1.15) 0.63 (1.16)
Girls
All 0.45 (1.08) 0.54 (1.10) 0.56 (1.13)
Sports club membership 0.27 (0.96) 0.32 (1.00) 0.35 (1.06)
No sports club membership 0.54 (1.13) 0.64 (1.13) 0.65 (1.15)
Boys
All 0.28 (1.08) 0.45 (1.10) 0.50 (1.07)
Sports club membership 0.25 (0.96) 0.38 (1.02) 0.43 (0.97)
No sports club membership 0.30 (1.20) 0.52 (1.18) 0.59 (1.17)
Overweight and obesity, No. (%) a
Total (n = 764) 155 (20.3) 169 (22.1) 184 (24.1)
Sports club membership (n = 322) 51 (15.8) 58 (18.0) 65 (20.2)
No sports club membership (n = 442) 104 (23.5) 111 (25.1) 119 (26.9)
Girls
Total (n = 383) 91 (23.8) 97 (25.3) 103 (26.9)
Sports club membership (n = 119) 20 (16.8) 24 (20.2) 26 (21.8)
No sports club membership (n = 264) 71 (26.9) 73 (27.7) 77 (29.2)
Boys
Total (n = 381) 64 (16.8) 72 (18.9) 81 (21.3)
Sports club membership (n = 203) 31 (15.3) 34 (16.7) 39 (19.2)
No sports club membership (n = 178) 33 (18.5) 38 (21.3) 42 (23.6)

Abbreviations: 6-min run, 6-minute run endurance test; BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); ND, not determined.

a

Defined as a BMI of 25 or greater.