condition mean min max ZT0-3 136.071523 136.071523 136.071523 ZT4-7 154.4879445 154.4879445 154.4879445 ZT8-11 177.07215250000002 177.07215250000002 177.07215250000002 ZT12-15 162.8819995 162.8819995 162.8819995 ZT16-19 214.8776095 214.8776095 214.8776095 ZT20-23 265.01269449999995 265.01269449999995 265.01269449999995