condition mean min max ZT0-3 0.2968115 0.2246295 0.3689935 ZT4-7 0.37652949999999996 0.37652949999999996 0.37652949999999996 ZT8-11 0.448755 0.448755 0.448755 ZT12-15 0 0 0 ZT16-19 0.4418105 0.4418105 0.4418105 ZT20-23 0.2218535 0.2218535 0.2218535