condition mean min max ZT0-3 1.9007275 1.698615 2.10284 ZT4-7 1.403496 1.403496 1.403496 ZT8-11 2.122725 2.122725 2.122725 ZT12-15 0 0 0 ZT16-19 3.47906 3.47906 3.47906 ZT20-23 2.38043 2.38043 2.38043