condition mean min max ZT0-3 29.2557 27.3461 31.165300000000002 ZT4-7 31.1348 31.1348 31.1348 ZT8-11 22.6697 22.6697 22.6697 ZT12-15 0 0 0 ZT16-19 17.1877 17.1877 17.1877 ZT20-23 28.67955 28.67955 28.67955