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. 2011 Jul 27;1(3):384–393. doi: 10.1007/s13142-011-0058-7

Table 3.

Changes in intervention outcomes by class size

Pre-mean Post-mean t p Cohen's d
Unhealthy physical days
1 to 7 participants 5.25 3.72 1.17 0.2475 0.246
8 to 12 participants 4.42 4.01 0.77 0.4420 0.054
13 to 20 participants 4.87 4.14 1.99 0.0474 0.099
21 to 42 participants 4.47 4.66 −0.18 0.8572 −0.027
All class sizes 4.80 4.19 2.12 0.0338 0.081
Days physically active
1 to 7 participants 3.67 3.85 0.52 0.6038 0.085
8 to 12 participants 3.49 3.86 3.06 0.0024 0.170
13 to 20 participants 3.54 3.88 3.72 0.0002 0.152
21 to 42 participants 3.52 4.03 2.04 0.0446 0.246
All class sizes 3.55 3.91 5.15 <0.0001 0.158
Falls efficacy scale
1 to 7 participants 14.19 15.81 3.35 0.0015 0.764
8 to 12 participants 14.21 16.22 10.84 <0.0001 0.690
13 to 20 participants 14.24 16.24 13.20 <0.0001 0.621
21 to 42 participants 14.42 16.58 5.64 <0.0001 0.727
All class sizes 14.28 16.28 18.27 <0.0001 0.640
Days limited usual activity
1 to 7 participants 3.28 2.00 1.27 0.2113 0.265
8 to 12 participants 2.48 2.07 1.19 0.2348 0.076
13 to 20 participants 2.57 2.38 0.70 0.4815 0.033
21 to 42 participants 2.51 1.83 1.08 0.2851 0.154
All class sizes 2.52 2.16 1.80 0.0726 0.063

Statistical significance at p = 0.0025 with the Bonferroni correction for 20 independent analyses