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Table 7 Test results for a linear trend of the hair growth for each skin type

From: “Cold” X5 Hairlaser™ used to treat male androgenic alopecia and hair growth: an uncontrolled pilot study

Dataset Fitzpatrick skin type Sample size (n) Repeated measures ANOVA Post-hoc linear trend test
F p-value p-value Slope R2value
Complete data ( n= 48) I 6 0.61 0.6897
II 13 3.16 0.0135 0.0464 1.400 0.0053
III 15 1.54 0.1879
IV 14 4.62 0.0011 0.0003 2.114 0.0229
Mixed data ( n= 70) I 7 0.66 0.6599
II 20 5.19 0.0003 0.0006 1.791 0.0083
III 27 2.49 0.0346 0.0046 0.953 0.0025
  IV 16 4.73 0.0008 0.0004 1.846 0.0169