condition mean min max ZT0-3 324.03678 324.03678 324.03678 ZT4-7 225.78527100000002 225.78527100000002 225.78527100000002 ZT8-11 131.95898499999998 131.95898499999998 131.95898499999998 ZT12-15 187.938388 187.938388 187.938388 ZT16-19 134.367579 134.367579 134.367579 ZT20-23 140.501348 140.501348 140.501348