condition mean min max ZT0-3 5.50133 5.50133 5.50133 ZT4-7 3.398445 3.398445 3.398445 ZT8-11 4.166869999999999 4.166869999999999 4.166869999999999 ZT12-15 4.55381 4.55381 4.55381 ZT16-19 6.3688400000000005 6.3688400000000005 6.3688400000000005 ZT20-23 4.93985 4.93985 4.93985