condition mean min max ZT0-3 10.22601 10.22601 10.22601 ZT4-7 7.117465000000001 7.117465000000001 7.117465000000001 ZT8-11 5.736525 5.736525 5.736525 ZT12-15 6.87992 6.87992 6.87992 ZT16-19 12.373850000000001 12.373850000000001 12.373850000000001 ZT20-23 11.30595 11.30595 11.30595