condition mean min max ZT0-3 217.5 217.5 217.5 ZT4-7 238.7 238.7 238.7 ZT8-11 275.3 275.3 275.3 ZT12-15 412.54999999999995 412.54999999999995 412.54999999999995 ZT16-19 373.6 373.6 373.6 ZT20-23 211.85000000000002 211.85000000000002 211.85000000000002