condition mean min max ZT0-3 2.22802 1.968665 2.487375 ZT4-7 2.0858299999999996 2.0858299999999996 2.0858299999999996 ZT8-11 3.777055 3.777055 3.777055 ZT12-15 0 0 0 ZT16-19 3.1613550000000004 3.1613550000000004 3.1613550000000004 ZT20-23 3.459825 3.459825 3.459825