Linear mixed models ( intention-to-treat ) revealed significant between-group differences for fathers ' weight ( P < .001 , d = 0.24 ) , with HDHK fathers losing more weight ( -3.3 kg ; 95 % CI , -4.3 , -2.4 ) than control fathers ( 0.1 kg ; 95 % CI , -0.9,1.0 ) .