condition mean min max ZT0-3 12.356455 12.356455 12.356455 ZT4-7 11.6243155 11.6243155 11.6243155 ZT8-11 11.5141425 11.5141425 11.5141425 ZT12-15 11.534069500000001 11.534069500000001 11.534069500000001 ZT16-19 10.263961 10.263961 10.263961 ZT20-23 10.755426 10.755426 10.755426