condition mean min max ZT0-3 10.282499999999999 10.282499999999999 10.282499999999999 ZT4-7 8.205075 8.205075 8.205075 ZT8-11 11.773050000000001 11.773050000000001 11.773050000000001 ZT12-15 12.062745 12.062745 12.062745 ZT16-19 14.1006 14.1006 14.1006 ZT20-23 9.97998 9.97998 9.97998