condition mean min max ZT0-3 22.202724744999998 21.25597249 23.149476999999997 ZT4-7 26.55452271 25.975094300000002 27.13395112 ZT8-11 39.940012567500006 30.805124395 49.074900740000004 ZT12-15 53.889268810000004 49.392888330000005 58.38564929 ZT16-19 44.69117414 40.58343247 48.79891581 ZT20-23 30.25761678 28.865707115 31.649526445