condition mean min max ZT0-3 31.0473 28.951 33.1436 ZT4-7 23.4272 23.4272 23.4272 ZT8-11 4.73655 4.73655 4.73655 ZT12-15 0 0 0 ZT16-19 11.045385 11.045385 11.045385 ZT20-23 29.006700000000002 29.006700000000002 29.006700000000002