The significance level was set at 0.05. Statistical analyses were computed using Stata/IC 15.0 (StataCorp LP, College Station, Texas, USA). A paired t-test sample size estimation yielded a group size of ten patients for differences in alpha angle (alpha 0.05, power 0.8). The estimation is based on a minimal clinically important difference of 10° according to Barrientos.24 (link) The differences in alpha angle and ROM were tested for normality using the Shapiro–Wilk test, and were never rejected (p < 0.05). Hence, normality was assumed, and paired t-tests (two-sided) were used to test for differences in alpha angle and ROM. Mean and standard deviation are reported if not stated otherwise. The significance level was chosen at 0.05. Statistical analyses were computed using Stata/IC 15.1 (StataCorp LP, College Station, Texas, USA).
Protocol detail
Evaluating Alpha Angle and ROM Changes
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Other organizations : University of Zurich
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Variable analysis
independent variables
- None explicitly mentioned
- Alpha angle
- Range of motion (ROM)
- None explicitly mentioned
- Positive control: None mentioned
- Negative control: None mentioned
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