condition mean min max ZT0-3 11.505700000000001 11.505700000000001 11.505700000000001 ZT4-7 6.396565000000001 6.396565000000001 6.396565000000001 ZT8-11 8.80826 8.80826 8.80826 ZT12-15 8.94186 8.94186 8.94186 ZT16-19 12.9327 12.9327 12.9327 ZT20-23 12.54535 12.54535 12.54535