condition mean min max ZT0-3 45.900000000000006 45.900000000000006 45.900000000000006 ZT4-7 23.5 23.5 23.5 ZT8-11 20.450000000000003 20.450000000000003 20.450000000000003 ZT12-15 18.55 18.55 18.55 ZT16-19 36.9 36.9 36.9 ZT20-23 46.699999999999996 46.699999999999996 46.699999999999996