condition mean min max ZT0-3 31.2407 31.2407 31.2407 ZT4-7 36.79885 36.79885 36.79885 ZT8-11 29.659149999999997 29.659149999999997 29.659149999999997 ZT12-15 31.128950000000003 31.128950000000003 31.128950000000003 ZT16-19 47.8836 47.8836 47.8836 ZT20-23 50.92353333333333 50.92353333333333 50.92353333333333