condition mean min max ZT0-3 197.314843 197.314843 197.314843 ZT4-7 322.388485 322.388485 322.388485 ZT8-11 313.88368049999997 313.88368049999997 313.88368049999997 ZT12-15 227.57833900000003 227.57833900000003 227.57833900000003 ZT16-19 134.7528615 134.7528615 134.7528615 ZT20-23 96.356146 96.356146 96.356146