condition mean min max ZT0-3 1.89963 1.6481249999999998 2.151135 ZT4-7 2.5085050000000004 2.5085050000000004 2.5085050000000004 ZT8-11 8.561045 8.561045 8.561045 ZT12-15 0 0 0 ZT16-19 7.352515 7.352515 7.352515 ZT20-23 4.09222 4.09222 4.09222