During the 52 weeks maintenance period the continuous dietary maintenance group support on average gained 1.1 kg ( 95 % CI : -0.3:2.5 ) body mass , the exercise group gained 6.6 kg ( 95 % CI 5.4:7.8 ) and the no-attention group gained 4.8 kg ( 95 % CI : 2.9:6.7 ) .