condition mean min max ZT0-3 9.18405 9.18405 9.18405 ZT4-7 10.467310999999999 10.467310999999999 10.467310999999999 ZT8-11 10.080299 10.080299 10.080299 ZT12-15 8.9506205 8.9506205 8.9506205 ZT16-19 9.913513 9.913513 9.913513 ZT20-23 8.3696465 8.3696465 8.3696465