condition mean min max ZT0-3 237.958162 237.958162 237.958162 ZT4-7 251.667197 251.667197 251.667197 ZT8-11 198.879842 198.879842 198.879842 ZT12-15 235.108251 235.108251 235.108251 ZT16-19 243.7136365 243.7136365 243.7136365 ZT20-23 282.934117 282.934117 282.934117