condition mean min max ZT0-3 296.079689 296.079689 296.079689 ZT4-7 197.500806 197.500806 197.500806 ZT8-11 161.26595650000002 161.26595650000002 161.26595650000002 ZT12-15 207.1316675 207.1316675 207.1316675 ZT16-19 235.9307195 235.9307195 235.9307195 ZT20-23 212.65787450000002 212.65787450000002 212.65787450000002