condition mean min max ZT0-3 11.595683 11.595683 11.595683 ZT4-7 11.5977455 11.5977455 11.5977455 ZT8-11 11.4304005 11.4304005 11.4304005 ZT12-15 12.495878999999999 12.495878999999999 12.495878999999999 ZT16-19 11.9989805 11.9989805 11.9989805 ZT20-23 10.153719500000001 10.153719500000001 10.153719500000001