condition mean min max ZT0-3 7.07243435875 5.701867901 8.4430008165 ZT4-7 12.205766475249998 10.335874515499999 14.075658435 ZT8-11 20.8559826675 15.783865865 25.92809947 ZT12-15 29.9255899325 29.32474431 30.526435555 ZT16-19 24.5440236625 23.43528043 25.652766895 ZT20-23 27.22307568 25.302050475 29.144100885