condition mean min max ZT0-3 27.056350000000002 24.6033 29.5094 ZT4-7 24.709049999999998 24.709049999999998 24.709049999999998 ZT8-11 18.126350000000002 18.126350000000002 18.126350000000002 ZT12-15 0 0 0 ZT16-19 17.9831 17.9831 17.9831 ZT20-23 23.2843 23.2843 23.2843