# ♀ slope period r p
1951 -19.0 23.02 0.9698 0.018
2130 32.0 24.75 0.9867 0.004
2045 -11.2 22.85 0.9491 0.03
1940 -59.0 23-57 0.9669 0.018
1944 -10.9 22.84 0.9752 0.011
1947 -17.0 23.00 0.9071 0.064
1996 -6.0 22.65 0.9981 0.004
1986 -36.0 23.34 0.3873 0.34
1989 -22.0 23.05 0.5329 0.27
1990 92.0 24.26 0.9690 0.018
1985 -50.46 23.52 0.7948 0.14
1993 -10.89 22.84 0.9897 0.004
*does # 1939 and 1959 were excluded from this analysis due to the few days on which they entered the nest box (see Table I)
Table 2: Linear regression analysis to determine circadian periodicity of nursing*