condition mean min max ZT0-3 52.44255 51.685900000000004 53.1992 ZT4-7 16.0892 16.0892 16.0892 ZT8-11 5.722225 5.722225 5.722225 ZT12-15 0 0 0 ZT16-19 19.7847 19.7847 19.7847 ZT20-23 24.8739 24.8739 24.8739