condition mean min max ZT0-3 3.68127 3.444845 3.917695 ZT4-7 4.53728 4.53728 4.53728 ZT8-11 4.9639050000000005 4.9639050000000005 4.9639050000000005 ZT12-15 0 0 0 ZT16-19 6.635730000000001 6.635730000000001 6.635730000000001 ZT20-23 5.442175000000001 5.442175000000001 5.442175000000001