condition mean min max ZT0-3 3.18914007575 2.513323351 3.8649568005 ZT4-7 8.43492752875 8.0714527235 8.798402334 ZT8-11 19.01108913 13.598341245 24.423837014999997 ZT12-15 69.3545081625 58.15281244 80.556203885 ZT16-19 63.2193071875 56.78789775 69.650716625 ZT20-23 44.50667293 42.52002643 46.49331943