condition mean min max ZT0-3 253.784303 253.784303 253.784303 ZT4-7 185.1181 185.1181 185.1181 ZT8-11 130.0674995 130.0674995 130.0674995 ZT12-15 82.3167425 82.3167425 82.3167425 ZT16-19 117.5447405 117.5447405 117.5447405 ZT20-23 125.8180395 125.8180395 125.8180395