Correction to: npj Digital Medicine 1:2; https://doi.org/10.1038/s41746-017-0002-4, published online 15 January 2018

The original version of this Review Article contained calculation errors within the abstract:

“Body mass index (−0.96; 95% CI: −2.30, 0.37)” has been corrected to “Body mass index (−0.73; 95% CI: −1.84, 0.38)”, “BMI I2 statistic 92% (95% Confidence Interval: [82%, 96%]” was corrected to “BMI I2 statistic 92% (95% Confidence Interval: [83%, 96%]”, “body fat percentage (0.19; −1.2,1.57)” has been corrected to “body fat percentage (−0.11; −1.56, 1.34)”, I2 statistic 85% (95% [56%, 95%])” was corrected to “body fat “I2 statistic 86% (95% [59%, 95%])”, and “diastolic blood pressure (−0.74; −2.34, 0.86)” has been corrected to “diastolic blood pressure (−0.99; −2.73, 0.74)”, “diastolic blood pressure I2 statistic 28% (95% [0%, 73%])” has been changed to “diastolic blood pressure I2 statistic 44% (95% [0%, 81%])”. These corrections have been repeated in the results section and Figs. 2, 5 and 7.

Fig. 2
figure 1

Point estimates of the mean difference for each study (green squares) and the corresponding 95% Confidence Intervals (horizontal black lines) are shown, with the size of the green square representing the relative weight of the study. The black diamond represents the overall pooled estimate, with the tips of the diamond representing the 95% Confidence Intervals

Fig. 5
figure 2

Point estimates of the mean difference for each study (green squares) and the corresponding 95% confidence intervals (horizontal lines) are shown, with the size of the green square representing the relative weight of the study. The black diamond represents the overall pooled estimate, with the tips of the diamond representing the 95% Confidence Intervals

Fig. 7
figure 3

Point estimates of the mean difference for each study (green squares) and the corresponding 95% Confidence Intervals (horizontal lines) are shown, with the size of the green square representing the relative weight of the study. The black diamond represents the overall pooled estimate, with the tips of the diamond representing the 95% Confidence Intervals

These errors have now been corrected in the HTML and PDF versions of this Article.