| Outcomes | Overall effect, | Mean difference | All studies | Healthy | Non-healthy | All Studies | Healthy | Non-healthy |
| HF | 4.69 ()* | 1.39 ()# | 5.25 ()* | 0.08 [0.05, 0.10]* | 0.07 [−0.03, 0.17]# | 0.08 [0.05, 0.10]* | LF | 0.03 () | 0.72 () | 2.04 ()* | 0.01 [−0.38, 0.40] | 0.15 [−0.26, 0.56] | −0.98 [−1.93, −0.04]* | LF/HF ratio | 2.18 ()* | 1.26 () | 15.82 ()* | −0.33 [−0.63, −0.03]* | −0.26 [−0.66, 0.14] | −0.50 [−0.56, −0.44]* | HF norm | 5.00 ()* | 5.00 ()* | — | 0.51 [0.31, 0.70]* | 0.51 [0.31, 0.70]* | NA | LF norm | 4.03 ()* | 4.03 ()* | — | −0.30 [−0.44, −0.15]* | −0.30 [−0.44, −0.15]* | NA | LI4 on HF | 15.82 ()* | — | — | 0.21 [−0.05, 0.47] | — | — | LI4 on LF/HF ratio | 0.04 () | — | — | −0.01 [−0.29, 0.27] | — | — | LI4 on HF norm | 0.24 () | — | — | 1.20 [−8.64, 11.04] | — | — | LI4 on LF norm | 0.36 () | — | — | −1.45 [9.32, 6.41] | — | — | PC6 on HF | 5.47 ()* | — | 5.25 ()* | 0.07 [0.05, 0.10]* | — | 0.08 [0.05, 0.10]* | PC6 on LF | 0.57 (0.57) | — | — | −0.05 [−0.24, 0.13] | — | — | PC6 on LF/HF ratio | 2.23 ()* | — | 15.82 ()* | −0.27 [−0.51, −0.03]* | — | −0.50 [−0.56, −0.44]* | PC6 on HF norm | 0.20 () | — | — | 0.80 [−6.99, 8.58] | — | — | PC6 on LF norm | 0.15 () | — | — | −0.45 [−6.42, 5.52] | — | — | ST36 on HF | 4.47 ()* | 3.00 ()* | — | 0.07 [0.04, 0.11]* | −99.51 [−164.56, −34.45]* | — | ST36 on LF | 0.96 () | — | — | −136.15 [−414.89, 142.59] | — | — | ST36 on LF/HF ratio | 0.61 () | — | — | −0.09 [−0.36, 0.19] | — | — |
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