Different Training Durations and Frequencies of Tai Chi for Bone Mineral Density Improvement: A Systematic Review and Meta-Analysis

Table 3

Subgroup analyses between the Tai Chi and the nonexercise group for the outcome BMD change in the femoral neck according to intervention durations and frequencies.

Subgroup	n	SMD, 95% CI		Heterogeneity
Intervention duration
≤10 months	5	0.31, 95% [−0.01, 0.63]	0.06	I^2 = 59%,  = 0.04
>10 months	8	0.51, 95% [0.12, 0.91]	0.01	I^2 = 76%,  = 0.0001
Intervention frequencies
≤4 days/week	5	0.24, 95% [−0.00, 0.48]	0.05	I^2 = 0%,  = 0.59
>days/week	8	0.53, 95% [0.15, 0.91]	0.006	I^2 = 80%,  < 0.00001