condition mean min max ZT0-3 288.532834 288.532834 288.532834 ZT4-7 367.2700115 367.2700115 367.2700115 ZT8-11 426.98936549999996 426.98936549999996 426.98936549999996 ZT12-15 469.59900100000004 469.59900100000004 469.59900100000004 ZT16-19 386.87732700000004 386.87732700000004 386.87732700000004 ZT20-23 278.48531049999997 278.48531049999997 278.48531049999997