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Table 3 Power calculations for child anthropometric data

From: Impact of a complex gender-transformative intervention on maternal and child health outcomes in the eastern Democratic Republic of Congo: protocol of a longitudinal parallel mixed-methods study

Effect size Shift of median to ICCa SD of random village effect Child in every HH Child in 50% HH
Power Power
0.27 SD P61 0.01 0.1 SD 99% 86%
  0.02 0.14 SD 98% 84%
  0.03 0.18 SD 97% 83%
  0.04 0.21 SD 96% 81%
  0.05 0.23 SD 95% 79%
  0.10 0.33 SD 86%
0.25 SD P60 0.01 0.1 SD 97% 80%
  0.02 0.14 SD 96% 78%
  0.03 0.18 SD 95% 77%
  0.04 0.21 SD 93% 75%
  0.05 0.23 SD 91% 73%
  0.10 0.33 SD 80%
0.2 SD P58 0.01 0.1 SD 88%
  0.02 0.14 SD 84%
  0.03 0.18 SD 81%
  0.04 0.21 SD 78%
  0.05 0.23 SD 75%
  1. Table 3 gives the achievable power for different effect sizes and intra class correlation coefficients. The expected power is given both under the assumption that a) a child under 5 years old will be found in each household, and b) that a child under 5 years old is found only in every other household. Intra-class coefficients reported in other African contexts range from 0.01 to 0.05
  2. SD standard deviation of individual growth rates
  3. aProportion of variance explained by the factor village