condition mean min max ZT0-3 5.910622500000001 5.443160000000001 6.3780850000000004 ZT4-7 7.156965 7.156965 7.156965 ZT8-11 5.517165 5.517165 5.517165 ZT12-15 0 0 0 ZT16-19 6.844110000000001 6.844110000000001 6.844110000000001 ZT20-23 10.169545 10.169545 10.169545