condition mean min max ZT0-3 10.581481 10.581481 10.581481 ZT4-7 9.808792 9.808792 9.808792 ZT8-11 9.9676845 9.9676845 9.9676845 ZT12-15 9.266123 9.266123 9.266123 ZT16-19 9.3548205 9.3548205 9.3548205 ZT20-23 10.677422 10.677422 10.677422