Table 4: Total testosterone levels (nmol/l), means and s.d. after start, first and second treatment

From: Improvement of erectile function with Prelox: a randomized, double-blind, placebo-controlled, crossover trial

 Group AStatistical significanceGroup BStatistical significanceComparison
Start17.51 (3.7) 18.13 (2.4)  
  P<0.02 P<0.000051 vs 2
First treatment18.3 (3.1) 22.0 (2.6)  
  P<0.000005 P<0.0000052 vs 3
Second treatment22.2 (2.9) 19.3 (2.1)