condition mean min max ZT0-3 585.8176666666667 197.89749999999998 814.505 ZT4-7 291.07349999999997 291.07349999999997 291.07349999999997 ZT8-11 156.166 156.166 156.166 ZT12-15 292.21125 236.65300000000002 347.7695 ZT16-19 606.0909999999999 606.0909999999999 606.0909999999999 ZT20-23 784.1365000000001 784.1365000000001 784.1365000000001