condition mean min max ZT0-3 1.9010266666666666 1.5215649999999998 2.29894 ZT4-7 2.0289900000000003 2.0289900000000003 2.0289900000000003 ZT8-11 1.760525 1.760525 1.760525 ZT12-15 1.735583 1.430796 2.0403700000000002 ZT16-19 1.2633 1.2633 1.2633 ZT20-23 1.751215 1.751215 1.751215