condition mean min max ZT0-3 494.15049139999996 258.01223250000004 730.2887503 ZT4-7 674.075396975 567.85288855 780.2979054 ZT8-11 585.69623035 573.05101615 598.34144455 ZT12-15 195.317212055 83.322687255 307.311736855 ZT16-19 45.996970425 44.748364135 47.245576715 ZT20-23 47.012710145 44.321312665 49.704107625000006