condition mean min max ZT0-3 217.246035 217.246035 217.246035 ZT4-7 177.73289499999998 177.73289499999998 177.73289499999998 ZT8-11 194.2950545 194.2950545 194.2950545 ZT12-15 212.6515165 212.6515165 212.6515165 ZT16-19 255.5428855 255.5428855 255.5428855 ZT20-23 243.242508 243.242508 243.242508