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Washington State Institute for Public Policy
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Tai Chi (general population)

Healthcare: Falls Prevention for Older Adults
Benefit-cost methods last updated December 2024.  Literature review updated January 2018.
Tai Chi (also known as Tai Qi or Tai Ji Quan) is a form of exercise that emphasizes balance, postural alignment, and coordinated movement. We include group Tai Chi classes for falls prevention among community-dwelling older adults in a general population. Classes were typically taught by a trained Tai Chi instructor in a community setting and included an average of ten participants per class. Studies in this review provided one-hour group Tai Chi classes three times per week for 3 to 12 months and averaged 113 hours of total class time.

We report a separate analysis on Tai Chi for falls prevention for community-dwelling older adults at high risk for falls.
 
ALL
BENEFIT-COST
META-ANALYSIS
CITATIONS
For an overview of WSIPP's Benefit-Cost Model, please see this guide. The estimates shown are present value, life cycle benefits and costs. All dollars are expressed in the base year chosen for this analysis (2023).  The chance the benefits exceed the costs are derived from a Monte Carlo risk analysis. The details on this, as well as the economic discount rates and other relevant parameters are described in our Technical Documentation.
Benefit-Cost Summary Statistics Per Participant
Benefits to:
Taxpayers $153 Benefits minus costs $229
Participants $19 Benefit to cost ratio $1.56
Others $24 Chance the program will produce
Indirect $442 benefits greater than the costs 78%
Total benefits $639
Net program cost ($409)
Benefits minus cost $229

‡The effect size for this outcome indicates an incidence rate ratio (IRR), not a standardized mean difference effect size. An IRR less than one indicates a lower rate of the outcome in the treatment group relative to the comparison group; an IRR greater than one indicates a higher rate of the outcome. The treatment n for this outcome represents person-years.

Meta-analysis is a statistical method to combine the results from separate studies on a program, policy, or topic to estimate its effect on an outcome. WSIPP systematically evaluates all credible evaluations we can locate on each topic. The outcomes measured are the program impacts measured in the research literature (for example, impacts on crime or educational attainment). Treatment N represents the total number of individuals or units in the treatment group across the included studies.

An effect size (ES) is a standard metric that summarizes the degree to which a program or policy affects a measured outcome. If the effect size is positive, the outcome increases. If the effect size is negative, the outcome decreases. See Estimating Program Effects Using Effect Sizes for additional information on how we estimate effect sizes.

The effect size may be adjusted from the unadjusted effect size estimated in the meta-analysis. Historically, WSIPP adjusted effect sizes to some programs based on the methodological characteristics of the study. For programs reviewed in 2024 or later, we do not make additional adjustments, and we use the unadjusted effect size whenever we run a benefit-cost analysis.

Research shows the magnitude of effects may change over time. For those effect sizes, we estimate outcome-based adjustments, which we apply between the first time ES is estimated and the second time ES is estimated. More details about these adjustments can be found in our Technical Documentation.

Meta-Analysis of Program Effects
Outcomes measured Treatment age No. of effect sizes Treatment N Effect sizes (ES) and standard errors (SE) used in the benefit-cost analysis Unadjusted effect size (random effects model)
First time ES is estimated Second time ES is estimated
ES SE Age ES SE Age ES p-value
Falls‡
An event which results in a person coming to rest inadvertently on the ground or floor or other lower level.
 72 2 91 0.593 0.092 72 1.000 0.000 73 0.593 0.001
1In addition to the outcomes measured in the meta-analysis table, WSIPP measures benefits and costs estimated from other outcomes associated with those reported in the evaluation literature. For example, empirical research demonstrates that high school graduation leads to reduced crime. These associated measures provide a more complete picture of the detailed costs and benefits of the program.

2“Others” includes benefits to people other than taxpayers and participants. Depending on the program, it could include reductions in crime victimization, the economic benefits from a more educated workforce, and the benefits from employer-paid health insurance.

3“Indirect benefits” includes estimates of the net changes in the value of a statistical life and net changes in the deadweight costs of taxation.
Detailed Monetary Benefit Estimates Per Participant
Affected outcome: Resulting benefits:1 Benefits accrue to:
Taxpayers Participants Others2 Indirect3 Total
Falls Health care associated with falls $153 $19 $24 $77 $274
Mortality associated with falls $0 $0 $0 $570 $570
Program cost Adjustment for deadweight cost of program $0 $0 $0 ($205) ($205)
Totals $153 $19 $24 $442 $639
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Detailed Annual Cost Estimates Per Participant
Annual cost Year dollars Summary
Program costs $334 2016 Present value of net program costs (in 2023 dollars) ($409)
Comparison costs $0 2016 Cost range (+ or -) 50%
Per-participant cost estimates are based on weighted average program costs in the included studies. We estimate provider hours; apply the 2016 mean hourly wage estimate for Washington State reported by the Bureau of Labor Statistics (retrieved March 2018) for fitness and aerobics instructors; and increase wages by a factor of 1.441 to account for the cost of employee benefits. The included studies average 113 hours of exercise class. We assume each class includes ten participants.
The figures shown are estimates of the costs to implement programs in Washington. The comparison group costs reflect either no treatment or treatment as usual, depending on how effect sizes were calculated in the meta-analysis. The cost range reported above reflects potential variation or uncertainty in the cost estimate; more detail can be found in our Technical Documentation.
Benefits Minus Costs
Benefits by Perspective
Taxpayer Benefits by Source of Value
Benefits Minus Costs Over Time (Cumulative Discounted Dollars)
The graph above illustrates the estimated cumulative net benefits per-participant for the first fifty years beyond the initial investment in the program. We present these cash flows in discounted dollars. If the dollars are negative (bars below $0 line), the cumulative benefits do not outweigh the cost of the program up to that point in time. The program breaks even when the dollars reach $0. At this point, the total benefits to participants, taxpayers, and others, are equal to the cost of the program. If the dollars are above $0, the benefits of the program exceed the initial investment.

Citations Used in the Meta-Analysis

Wolf, S.L., Barnhart, H.X., Kutner, N.G., McNeely, E., Coogler, C., & Xu, T. (1996). Reducing frailty and falls in older persons: an investigation of Tai Chi and computerized balance training. Journal of the American Geriatrics Society, 44 (5), 489.

Woo, J., Hong, A., Lau, E., & Lynn, H. (2007). A randomised controlled trial of Tai Chi and resistance exercise on bone health, muscle strength and balance in community-living elderly people. Age and Ageing, 36 (3), 262-268.