condition mean min max ZT0-3 325.20000000000005 325.20000000000005 325.20000000000005 ZT4-7 363.3 363.3 363.3 ZT8-11 342.05 342.05 342.05 ZT12-15 322.15 322.15 322.15 ZT16-19 251.54999999999998 251.54999999999998 251.54999999999998 ZT20-23 335.5 335.5 335.5