condition mean min max ZT0-3 28.689217 28.689217 28.689217 ZT4-7 27.0426365 27.0426365 27.0426365 ZT8-11 26.907867000000003 26.907867000000003 26.907867000000003 ZT12-15 27.569543 27.569543 27.569543 ZT16-19 45.2098655 45.2098655 45.2098655 ZT20-23 70.2258755 70.2258755 70.2258755