condition mean min max ZT0-3 9.810008 9.810008 9.810008 ZT4-7 9.876843000000001 9.876843000000001 9.876843000000001 ZT8-11 9.7033625 9.7033625 9.7033625 ZT12-15 8.727606999999999 8.727606999999999 8.727606999999999 ZT16-19 9.327709500000001 9.327709500000001 9.327709500000001 ZT20-23 10.669983 10.669983 10.669983