condition mean min max ZT0-3 26.81755 21.88545 31.749650000000003 ZT4-7 25.70855 25.70855 25.70855 ZT8-11 9.15749 9.15749 9.15749 ZT12-15 0 0 0 ZT16-19 24.47535 24.47535 24.47535 ZT20-23 32.22225 32.22225 32.22225