condition mean min max ZT0-3 26.7203 26.7203 26.7203 ZT4-7 20.848550000000003 20.848550000000003 20.848550000000003 ZT8-11 19.5047 19.5047 19.5047 ZT12-15 25.717550000000003 25.717550000000003 25.717550000000003 ZT16-19 28.32695 28.32695 28.32695 ZT20-23 27.918599999999998 27.918599999999998 27.918599999999998