condition mean min max ZT0-3 29.797475 29.39235 30.2026 ZT4-7 19.6465 19.6465 19.6465 ZT8-11 21.75835 21.75835 21.75835 ZT12-15 0 0 0 ZT16-19 30.41185 30.41185 30.41185 ZT20-23 32.4009 32.4009 32.4009