condition mean min max ZT0-3 279.876518 279.876518 279.876518 ZT4-7 382.977441 382.977441 382.977441 ZT8-11 353.43537200000003 353.43537200000003 353.43537200000003 ZT12-15 348.38104350000003 348.38104350000003 348.38104350000003 ZT16-19 324.361363 324.361363 324.361363 ZT20-23 220.19020700000002 220.19020700000002 220.19020700000002