condition mean min max ZT0-3 9.2460275 8.88687 9.605184999999999 ZT4-7 3.895125 3.895125 3.895125 ZT8-11 5.11653 5.11653 5.11653 ZT12-15 0 0 0 ZT16-19 6.6379850000000005 6.6379850000000005 6.6379850000000005 ZT20-23 6.236935 6.236935 6.236935