condition mean min max ZT0-3 97.69295 97.69295 97.69295 ZT4-7 93.95855 93.95855 93.95855 ZT8-11 76.7273 76.7273 76.7273 ZT12-15 79.02435 79.02435 79.02435 ZT16-19 143.43200000000002 143.43200000000002 143.43200000000002 ZT20-23 139.6465 139.6465 139.6465