condition mean min max ZT0-3 12.821172 12.821172 12.821172 ZT4-7 13.290780999999999 13.290780999999999 13.290780999999999 ZT8-11 11.9478215 11.9478215 11.9478215 ZT12-15 14.1218125 14.1218125 14.1218125 ZT16-19 12.799390500000001 12.799390500000001 12.799390500000001 ZT20-23 13.1828825 13.1828825 13.1828825