condition mean min max ZT0-3 29.097485147500002 27.967241995000002 30.2277283 ZT4-7 26.649616268333332 25.16930067666667 28.12993186 ZT8-11 28.969153376666668 25.963900653333333 31.9744061 ZT12-15 33.25967493833333 31.176163626666668 35.34318625 ZT16-19 40.20907476 39.54297864 40.87517088 ZT20-23 32.510142935000005 30.990114249999998 34.030171620000004