condition mean min max ZT0-3 1.445585 1.281255 1.609915 ZT4-7 1.608315 1.608315 1.608315 ZT8-11 3.4681800000000003 3.4681800000000003 3.4681800000000003 ZT12-15 0 0 0 ZT16-19 4.138555 4.138555 4.138555 ZT20-23 2.325565 2.325565 2.325565