condition mean min max ZT0-3 0.1148399685 0.0 0.229679937 ZT4-7 0.32022984000000004 0.123350755 0.517108925 ZT8-11 1.65896634675 1.3812390835 1.93669361 ZT12-15 2.43631281725 2.3686827865 2.503942848 ZT16-19 1.0704724955 1.000206492 1.140738499 ZT20-23 0.41414500600000004 0.391360617 0.43692939500000005