condition mean min max ZT0-3 53.8587 53.8587 53.8587 ZT4-7 50.70515 50.70515 50.70515 ZT8-11 51.4994 51.4994 51.4994 ZT12-15 49.847049999999996 49.847049999999996 49.847049999999996 ZT16-19 57.236900000000006 57.236900000000006 57.236900000000006 ZT20-23 53.873400000000004 53.873400000000004 53.873400000000004