condition mean min max ZT0-3 278.95000000000005 278.95000000000005 278.95000000000005 ZT4-7 251.61599999999999 251.61599999999999 251.61599999999999 ZT8-11 182.9275 182.9275 182.9275 ZT12-15 187.6345 187.6345 187.6345 ZT16-19 199.91649999999998 199.91649999999998 199.91649999999998 ZT20-23 238.7455 238.7455 238.7455