condition mean min max ZT0-3 16.464203 16.464203 16.464203 ZT4-7 11.825603999999998 11.825603999999998 11.825603999999998 ZT8-11 9.266413 9.266413 9.266413 ZT12-15 11.034496 11.034496 11.034496 ZT16-19 10.3888765 10.3888765 10.3888765 ZT20-23 11.097156 11.097156 11.097156