condition mean min max ZT0-3 1.1592850000000001 1.1592850000000001 1.1592850000000001 ZT4-7 1.3218 1.3218 1.3218 ZT8-11 0.687723 0.687723 0.687723 ZT12-15 1.077562 1.077562 1.077562 ZT16-19 1.4770949999999998 1.4770949999999998 1.4770949999999998 ZT20-23 1.075535 1.075535 1.075535