condition mean min max ZT0-3 9.876909999999999 9.876909999999999 9.876909999999999 ZT4-7 8.60568 8.60568 8.60568 ZT8-11 9.44276 9.44276 9.44276 ZT12-15 8.05395 8.05395 8.05395 ZT16-19 12.66725 12.66725 12.66725 ZT20-23 11.3706 11.3706 11.3706