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. 2020 Mar 12;76(4):430–437. doi: 10.1016/j.mjafi.2019.11.001

Table 1.

t test for difference between means for outcome of hair density per sq cm for various variables after procedure.

Variable n = 52 Mean hair density per sq cm Standard error mean t test for equality of means
Mean difference Significance (2-tailed)
Age groups
 <33 years (median) 27 39.00 1.08 4.52 0.002
 >34 years 25 34.48 0.81
Stage of initial alopecia before procedure
 <4a 29 38.97 0.90 4.84 0.001
 >4b 23 34.13 1.01
Initial density of hair per sq cm
 <7 31 35.42 0.89 −3.49 0.694
 >8 21 38.90 1.19