condition mean min max ZT0-3 10.910354485 10.14122905 11.679479919999999 ZT4-7 8.33485602825 7.9515963195 8.718115737 ZT8-11 7.54542453175 6.736476846 8.3543722175 ZT12-15 6.521460977 6.4427838725 6.6001380815 ZT16-19 5.869314713750001 4.92790699 6.8107224375 ZT20-23 10.266561743499999 9.369028552 11.164094935