condition mean min max ZT0-3 27.55 27.55 27.55 ZT4-7 25.1 25.1 25.1 ZT8-11 35.5 35.5 35.5 ZT12-15 23.2 23.2 23.2 ZT16-19 15.350000000000001 15.350000000000001 15.350000000000001 ZT20-23 21.950000000000003 21.950000000000003 21.950000000000003