condition mean min max ZT0-3 13.181079 13.181079 13.181079 ZT4-7 10.778363 10.778363 10.778363 ZT8-11 10.6563855 10.6563855 10.6563855 ZT12-15 10.229417999999999 10.229417999999999 10.229417999999999 ZT16-19 11.381276 11.381276 11.381276 ZT20-23 12.400113000000001 12.400113000000001 12.400113000000001