condition mean min max ZT0-3 14.2662 13.483 15.049399999999999 ZT4-7 19.147 19.147 19.147 ZT8-11 17.52965 17.52965 17.52965 ZT12-15 0 0 0 ZT16-19 21.7667 21.7667 21.7667 ZT20-23 17.8151 17.8151 17.8151