condition mean min max ZT0-3 12.573410418249999 11.361822266499999 13.78499857 ZT4-7 11.9233625 10.35847677 13.48824823 ZT8-11 13.647897206666666 12.683238013333334 14.6125564 ZT12-15 12.1646871775 10.372906895 13.95646746 ZT16-19 11.769550493 10.737571619333334 12.801529366666667 ZT20-23 11.126445652833333 9.873835404 12.379055901666668