condition mean min max ZT0-3 12.6022 11.697199999999999 13.70065 ZT4-7 14.1713 14.1713 14.1713 ZT8-11 16.60835 16.60835 16.60835 ZT12-15 17.757075 17.28015 18.234 ZT16-19 15.639 15.639 15.639 ZT20-23 14.2023 14.2023 14.2023