condition mean min max ZT0-3 34.4082548175 26.442455715 42.37405392 ZT4-7 26.408571244999997 25.82751064 26.98963185 ZT8-11 20.1559159675 19.977660985 20.33417095 ZT12-15 17.012799117500002 15.92128812 18.104310115 ZT16-19 23.796431355 19.0999554 28.49290731 ZT20-23 35.17411346 30.10863089 40.23959603