Table 4.

Rates of missing data in placebo relative to treatment group in placebo controlled trials (n = 34)

Months of follow-up	Relative rate
	Mean (95 % CI)
3 months (n = 12)	1.36 (0.80, 2.29)
6 months (n = 16)	1.72 (1.26, 2.35)
12 months (n = 5)	1.78 (1.19, 2.64)
Total (n = 34)a	1.61 (1.29, 2.02)

17 trials were excluded due to not having a placebo group; trend test p value = 0.296

CI confidence intervals

^aThe total number of trials includes one trial with 24 months follow-up