condition mean min max ZT0-3 4.95406 4.601715 5.306405 ZT4-7 2.935995 2.935995 2.935995 ZT8-11 2.098955 2.098955 2.098955 ZT12-15 0 0 0 ZT16-19 5.1123899999999995 5.1123899999999995 5.1123899999999995 ZT20-23 6.02488 6.02488 6.02488