condition mean min max ZT0-3 4.0586225 4.0314250000000005 4.08582 ZT4-7 4.301075 4.301075 4.301075 ZT8-11 4.77177 4.77177 4.77177 ZT12-15 0 0 0 ZT16-19 5.33474 5.33474 5.33474 ZT20-23 5.469275 5.469275 5.469275