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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 sizeShift of median toICCaSD of random village effectChild in every HHChild in 50% HH
PowerPower
0.27 SDP610.010.1 SD99%86%
 0.020.14 SD98%84%
 0.030.18 SD97%83%
 0.040.21 SD96%81%
 0.050.23 SD95%79%
 0.100.33 SD86%
0.25 SDP600.010.1 SD97%80%
 0.020.14 SD96%78%
 0.030.18 SD95%77%
 0.040.21 SD93%75%
 0.050.23 SD91%73%
 0.100.33 SD80%
0.2 SDP580.010.1 SD88%
 0.020.14 SD84%
 0.030.18 SD81%
 0.040.21 SD78%
 0.050.23 SD75%
  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
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