condition mean min max ZT0-3 4.815105 4.34094 5.28927 ZT4-7 5.00385 5.00385 5.00385 ZT8-11 12.165199999999999 12.165199999999999 12.165199999999999 ZT12-15 0 0 0 ZT16-19 10.78801 10.78801 10.78801 ZT20-23 7.39433 7.39433 7.39433