Correlation matrix among the main variables for the whole N/Nih-HS rat sample. Correlations with p ≤.01 and p ≤.001 are shown in bold letters. ZM-E, open section entries (n); ZM-T, time spent (s) in the open sections; ZM-DEF, number of defecation boluses; ZM-SAP, stretched attend postures (n); ZM-BW, body weight right before the ZM test (g); NACT-DIST5, NACT-DIST30 distance (cm) travelled during the first 5 minutes and during the last 5 minutes, respectively, in the "automated novel-cage activity" test; SHAV, avoidances (n) in the shuttlebox; SHAV-LAT, mean response latency (s) in the shuttlebox task; ITC, intertrial crossings (n) in the shuttlebox task; SHAV-ITC avoidances plus intertrial crossings (n) in the shuttlebox task. N = 1456 N/Nih-HS rats of both sexes (see "Materials and Methods"). * p ≤ .01, **p ≤ .001, Pearson's correlation coefficient.