condition mean min max ZT0-3 239.05 239.05 239.05 ZT4-7 315.9 315.9 315.9 ZT8-11 285.2 285.2 285.2 ZT12-15 237.79999999999998 237.79999999999998 237.79999999999998 ZT16-19 275.79999999999995 275.79999999999995 275.79999999999995 ZT20-23 299.65 299.65 299.65