condition mean min max ZT0-3 36.196575 32.285650000000004 40.1075 ZT4-7 42.4538 42.4538 42.4538 ZT8-11 28.51565 28.51565 28.51565 ZT12-15 0 0 0 ZT16-19 59.61395 59.61395 59.61395 ZT20-23 41.92855 41.92855 41.92855