condition mean min max ZT0-3 55.557409 55.557409 55.557409 ZT4-7 42.914539000000005 42.914539000000005 42.914539000000005 ZT8-11 55.1889465 55.1889465 55.1889465 ZT12-15 78.60179550000001 78.60179550000001 78.60179550000001 ZT16-19 154.876172 154.876172 154.876172 ZT20-23 169.39336500000002 169.39336500000002 169.39336500000002