condition mean min max ZT0-3 8.1678325 8.06333 8.272335 ZT4-7 8.00428 8.00428 8.00428 ZT8-11 8.876945 8.876945 8.876945 ZT12-15 0 0 0 ZT16-19 8.86401 8.86401 8.86401 ZT20-23 8.934595 8.934595 8.934595