condition mean min max ZT0-3 34.9676 34.9676 34.9676 ZT4-7 19.70535 19.70535 19.70535 ZT8-11 13.630600000000001 13.630600000000001 13.630600000000001 ZT12-15 23.648249999999997 23.648249999999997 23.648249999999997 ZT16-19 52.77636666666667 52.77636666666667 52.77636666666667 ZT20-23 39.632 39.632 39.632