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

Table 4

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

Subgroup	n	SMD, 95%CI		Heterogeneity
Intervention duration
≤10 months	3	068, 95% [0.11, 1.26]	0.02	I^2 = 74%,  = 0.2
>10 months	8	0.41, 95% [0.15, 0.67]	0.002	I^2 = 51%,  = 0.05
Intervention frequencies
≤4 days/week	4	0.52, 95% [0.17, 0.87]	0.003	I^2 = 27%,  = 0.25
>days/week	7	0.46, 95% [0.11, 0.81]	0.009	I^2 = 80%,  < 0.002