Comprehensive Anaemia Programme and Personalized Therapies (CAPPT): protocol for a cluster-randomised controlled trial testing the effect women’s groups, home counselling and iron supplementation on haemoglobin in pregnancy in southern Nepal

Table 3 Power calculations based on different standard deviations and proportion of pregnancies detected < 20 weeks

% of pregnancies < 20 weeks¹	No of clusters per arm	Average number of Hb outcomes per cluster	ICC (rho)	CV cluster size	Detectable difference in Hb	Power with SD of 1.2	Power with SD of 1.25
50%	27	15.6	0.09	0.27	0.4	88.3%	85.7%
33%	27	10.4	0.09	0.27	0.4	82.1%	79.0%

ISSN: 1745-6215