condition mean min max ZT0-3 24.183883333333334 22.374200000000002 26.5125 ZT4-7 19.14445 19.14445 19.14445 ZT8-11 18.15185 18.15185 18.15185 ZT12-15 23.302100000000003 23.2997 23.3045 ZT16-19 20.875700000000002 20.875700000000002 20.875700000000002 ZT20-23 24.400350000000003 24.400350000000003 24.400350000000003