condition mean min max ZT0-3 54.070992402499996 45.9164843 62.225500505 ZT4-7 65.6186775275 58.050571455 73.1867836 ZT8-11 71.37630891500001 68.234691975 74.517925855 ZT12-15 66.47704396 59.83915784 73.11493008 ZT16-19 65.28376202749999 64.173037275 66.39448678 ZT20-23 66.0277940725 58.932534195 73.12305395