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Table 1 Indirect treatment comparison between TBZ and DEU (as reported by us in Rodrigues et al. [5]), both in odds ratios as initially reported, and converted to risk differences; and as reported by Claassen et al. [1] as risk differences

From: Meta-research metrics matter: letter regarding article “indirect tolerability comparison of Deutetrabenazine and Tetrabenazine for Huntington disease”

Adverse event

Indirect comparison

Rodrigues et al. [5]

Claassen et al. [1]

OR (95% CI)

(TBZ vs DEU)

RD (95% CI)

(DEU vs TBZ)

RD (95% CI)

(DEU vs TBZ)

SAE

5.44 (0.09 to 322.08)

−0.07 (−0.17 to 0.03)

−0.074 (−0.167 to 0.019)

Somnolence

4.95 (0.34 to 72.37)

−0.21 (−0.39 to −0.03)*

−0.215 (−0.392 to −0.037)*

Diarrhoea

0.07 (0.03 to 2.06)

0.12 (−0.03 to 0.27)

0.115 (−0.038 to 0.268)

Insomnia

14.18 (0.47 to 426.77)

−0.24 (−0.40 to −0.04)*

−0.237 (−0.387 to −0.087)*

Fatigue

1.21 (0.31 to 11.14)

−0.07 (−0.26 to 0.12)

−0.067 (−0.256 to 0.123)

Falls

2.71 (0.31 to 23.98)

−0.07 (−0.26 to 0.12)

−0.078 (−0.265 to 0.110)

Depression

17.15 (0.55 to 531.90)

−0.17 (−0.31 to −0.28)*

−0.170 (−0.304 to −0.037)*

  1. Presentation as risk differences produces statistically significant differences between DEU and TBZ that are not seen when presented as odds ratios; neither approach is intrinsically more accurate and an awareness of the difference is important. TBZ, tetrabenazine; DEU, deutetrabenazine; OR, odds ratio; 95% CI, 95% confidence interval; RD, risk difference; SAE, severe adverse events; *p-value < 0.05