condition mean min max ZT0-3 12.207920802833332 12.045626815666667 12.370214789999999 ZT4-7 10.368353391333333 9.20218565 11.534521132666667 ZT8-11 7.234478509833333 6.724134352 7.744822667666666 ZT12-15 10.2082215825 9.702250072333333 10.714193092666667 ZT16-19 9.221632219 8.363850829 10.079413609 ZT20-23 7.901464078 7.648024309 8.154903847