condition mean min max ZT0-3 0.0372355465 0.0 0.074471093 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0174987035 0.0 0.034997407 ZT12-15 0.010572261333333333 0.0 0.021144522666666665 ZT16-19 0.029793516000000003 0.0 0.059587032000000005 ZT20-23 0.0 0.0 0.0