condition mean min max ZT0-3 28.243283333333334 19.70465 42.72225 ZT4-7 48.854749999999996 48.854749999999996 48.854749999999996 ZT8-11 9.90964 9.90964 9.90964 ZT12-15 12.1081 10.7452 13.471 ZT16-19 12.253499999999999 12.253499999999999 12.253499999999999 ZT20-23 16.5301 16.5301 16.5301