condition mean min max ZT0-3 10.411983333333334 10.411983333333334 10.411983333333334 ZT4-7 8.62791 8.62791 8.62791 ZT8-11 11.24755 11.24755 11.24755 ZT12-15 10.710249999999998 10.710249999999998 10.710249999999998 ZT16-19 13.6245 13.6245 13.6245 ZT20-23 13.9299 13.9299 13.9299