In intention-to-treat analysis with imputation of missing observations , mean weight loss at 5 months for both treatment groups combined was 3.3 % ( 95 % CI 0.7-5 .0 % ) , regardless of intervention participation ( with no differences between randomized groups ( P = 0.19 ) ) , and was 4.9 % ( 95 % CI 2.1-6 .5 % ) for participants who viewed 9 episodes .