condition mean min max ZT0-3 6.137772927416666 5.4421976445 6.833348210333333 ZT4-7 4.7468894693333334 4.266555074 5.227223864666667 ZT8-11 5.2084289859999995 5.149269973 5.267587999 ZT12-15 5.429251613 4.458190262 6.400312963999999 ZT16-19 10.325466885 9.976712291 10.674221479 ZT20-23 12.168683251000001 11.476015565333334 12.861350936666668