IT_MEAN_DIFF
#undef IT_MEAN_DIFF
#define IT_MEAN_DIFF (res[i].stime / (double)res[i].gp_ct - gp_stat->mean)
#undef IT_MEAN_DIFF
#define IT_MEAN_DIFF (res[i].gp_ns / 1000.0 / (double)res[i].gp_ct - gp_stat->mean)