condition mean min max ZT0-3 8.4117775 7.78128 9.042275 ZT4-7 5.4115850000000005 5.4115850000000005 5.4115850000000005 ZT8-11 10.328295 10.328295 10.328295 ZT12-15 0 0 0 ZT16-19 11.424299999999999 11.424299999999999 11.424299999999999 ZT20-23 10.387820000000001 10.387820000000001 10.387820000000001