condition mean min max ZT0-3 9.12432 9.12432 9.12432 ZT4-7 4.9510000000000005 4.9510000000000005 4.9510000000000005 ZT8-11 6.86352 6.86352 6.86352 ZT12-15 7.612 7.612 7.612 ZT16-19 9.754 9.754 9.754 ZT20-23 9.650835 9.650835 9.650835