condition mean min max ZT0-3 11.43029 11.43029 11.43029 ZT4-7 12.254737 12.254737 12.254737 ZT8-11 11.756814 11.756814 11.756814 ZT12-15 11.913545500000001 11.913545500000001 11.913545500000001 ZT16-19 12.653836 12.653836 12.653836 ZT20-23 14.450503999999999 14.450503999999999 14.450503999999999