condition mean min max ZT0-3 346.599942 346.599942 346.599942 ZT4-7 324.401787 324.401787 324.401787 ZT8-11 344.0741845 344.0741845 344.0741845 ZT12-15 196.809011 196.809011 196.809011 ZT16-19 171.2935405 171.2935405 171.2935405 ZT20-23 152.12866 152.12866 152.12866