condition mean min max ZT0-3 24.529125 21.00425 28.054 ZT4-7 12.741399999999999 12.741399999999999 12.741399999999999 ZT8-11 7.562905 7.562905 7.562905 ZT12-15 0 0 0 ZT16-19 16.7459 16.7459 16.7459 ZT20-23 21.24465 21.24465 21.24465