condition mean min max ZT0-3 27.309074 27.309074 27.309074 ZT4-7 28.4758055 28.4758055 28.4758055 ZT8-11 30.740209 30.740209 30.740209 ZT12-15 49.7647375 49.7647375 49.7647375 ZT16-19 37.5215105 37.5215105 37.5215105 ZT20-23 20.032550999999998 20.032550999999998 20.032550999999998