showed a trendP = 0.052
After combining the patients and then subdividing into low NK and high NK groups, the patients in the high NK group showed a trend toward a higher implantation rate [20.4% (93/456) vs. 25.0% (126/505); P = 0.052] and abortion rate [20.3% (12/59) vs. 28.2% (22/78); P = 0.073] when compared with the low NK group.