condition mean min max ZT0-3 10.66984 7.9868500000000004 13.0195 ZT4-7 8.301365 8.301365 8.301365 ZT8-11 9.057414999999999 9.057414999999999 9.057414999999999 ZT12-15 9.306845 8.651485 9.962205 ZT16-19 9.71613 9.71613 9.71613 ZT20-23 11.55205 11.55205 11.55205