condition mean min max ZT0-3 11.171558333333333 8.316125 13.01745 ZT4-7 10.412465000000001 10.412465000000001 10.412465000000001 ZT8-11 7.305904999999999 7.305904999999999 7.305904999999999 ZT12-15 9.369152499999998 8.66982 10.068484999999999 ZT16-19 11.0503 11.0503 11.0503 ZT20-23 14.4677 14.4677 14.4677