condition mean min max ZT0-3 6.281610000000001 6.281610000000001 6.281610000000001 ZT4-7 6.916395 6.916395 6.916395 ZT8-11 8.148264999999999 8.148264999999999 8.148264999999999 ZT12-15 1.753825 1.753825 1.753825 ZT16-19 3.92704 3.92704 3.92704 ZT20-23 3.9055500000000003 3.9055500000000003 3.9055500000000003