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. 2011 Jun 21;20(10):1757–1764. doi: 10.1007/s00586-011-1874-7

Table 3.

Association between potential risk factors and outcome of brace treatment

Items N Percentage of curve progression Percentage of surgery
Risser sign
 0–1 177 35.0% 27.7%
 2–3 135 20.7% 8.1%
 P value (χ2) 0.008 P < 0.001
Gender
 Male 41 34.1% 26.8%
 Female 271 28.0% 18.0%
 P value (χ2) 0.304 0.203
Curve pattern
 Single thoracic curve 128 32.1% 23.4%
 Single thoracolumbar or lumbar curve 66 30.3% 17.6%
 Double major curve 118 24.5% 15.2%
 P value (χ2) 0.493 0.263
Initial curve magnitude
 <30° 195 27.2% 12.8%
 ≧30° 117 31.6% 29.9%
 P value (χ2) 0.113 <0.001