condition mean min max ZT0-3 0.7223107499999999 0.6433359999999999 0.8012855 ZT4-7 0.5325219999999999 0.5325219999999999 0.5325219999999999 ZT8-11 0.6316115 0.6316115 0.6316115 ZT12-15 0 0 0 ZT16-19 1.8636949999999999 1.8636949999999999 1.8636949999999999 ZT20-23 1.0654365000000001 1.0654365000000001 1.0654365000000001