condition mean min max ZT0-3 111.183575 111.183575 111.183575 ZT4-7 59.7528 59.7528 59.7528 ZT8-11 41.260450500000005 41.260450500000005 41.260450500000005 ZT12-15 34.169343 34.169343 34.169343 ZT16-19 21.1854815 21.1854815 21.1854815 ZT20-23 17.9208285 17.9208285 17.9208285