Figure 4. Natural killer cell cytotoxicity at 3 effector:target ratios for last unemployed time point and first employed time point (for the unemployed subsample who became employed) and for the matched employed subsample; n = 24 for each subsample. For matched pairs, the same time points were used as those in the unemployed subsample. Error bars represent standard errors of the mean. *p < .05 for the last unemployed time point versus the first time point after becoming employed for the unemployed who got new jobs.