condition mean min max ZT0-3 66.37368333333333 22.848300000000002 90.18925 ZT4-7 17.3461 17.3461 17.3461 ZT8-11 17.87845 17.87845 17.87845 ZT12-15 24.7192 20.887 28.5514 ZT16-19 42.721900000000005 42.721900000000005 42.721900000000005 ZT20-23 84.8176 84.8176 84.8176