Mean differences on PPTs were 1.2 kg ( 95 % CI = 0.7-1 .6 ) , 0.3 kg ( 95 % CI = 0.2-0 .8 ) , 2.0 kg ( 95 % CI = 1.6-2 .5 ) , and 1.7 kg ( 95 % CI = 1.3-2 .1 ) , for the AL , SL , AE , and SE groups , respectively .