condition mean min max ZT0-3 95.403549 95.403549 95.403549 ZT4-7 20.842662 20.842662 20.842662 ZT8-11 18.351478 18.351478 18.351478 ZT12-15 28.617608 28.617608 28.617608 ZT16-19 20.152192499999998 20.152192499999998 20.152192499999998 ZT20-23 64.7895295 64.7895295 64.7895295