condition mean min max ZT0-3 42.615825 41.8035 43.42815 ZT4-7 26.68965 26.68965 26.68965 ZT8-11 42.6901 42.6901 42.6901 ZT12-15 0 0 0 ZT16-19 61.99315 61.99315 61.99315 ZT20-23 51.4507 51.4507 51.4507