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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Early Hum Dev. 2014 Oct 23;90(12):885–890. doi: 10.1016/j.earlhumdev.2014.09.005

Table 2.

Mother and infant circadian parameters mean (SD) and change over time (n = 43 dyads).

Mother Infant

Model Parameter 4 wk 8 wk 12 wk F; pa 4 wk 8 wk 12 wk F; pa
Cosinor Mesor (Ln counts) 3.31 (.437) 3.24 (.251) 3.28 (.379) F=.644;p=.531 2.37 (.415) 2.58 (.384) 2.73 (.424) F=31.0;p<.001
Magnitude (Ln counts) 1.96 (.486) 2.29 (.269) 2.20 (.391) F=14.1;p<.001 .856 (.355) 1.13 (.399) 1.42 (.411) F=36.9;p<.001
Acrophase (dec. hours) 15.4 (1.15) 15.2 (.982) 15.2 (1.16) F=1.26;p=.295 15.2 (2.21) 14.5 (2.50) 14.2 (1.57) F=3.18;p=.052
R-squared GFI .297 (.100) .367 (.075) .357 (.105) F=16.4;p<.001 .082 (.057) .123 (.078) .175 (.091) F=22.9;p<.001
NPCRA (L5:M10) Amplitude (Ln counts) 3.64 (.793) 4.21 (.441) 4.14 (.560) F=13.1;p<.001 1.64 (.545) 2.22 (.643) 2.63 (.651) F=52.1;p<.001
L5 midpoint (dec. hours) 3.55 (2.53) 2.52 (1.79) 2.82 (1.61) F=3.19;p=.052 2.49 (2.72) 1.75 (2.66) .685 (1.78) F=12.9;p<.001
M10 midpoint (dec. hours) 15.1 (1.95) 15.2 (1.43) 14.8 (1.87) F=1.23;p=.302 14.2 (2.55) 13.5 (2.77) 13.5 (1.41) F=1.36;p=.267
IS .420 (.092) .498 (.078) .504 (.103) F=25.0;p<.001 .176 (.070) .245 (.084) .306 (.103) F=37.1;p<.001
IV .659 (.200) .510 (.130) .485 (.183) F=16.5;p<.001 1.17 (.314) 1.10 (.312) .959 (.240) F=9.86;p<.001
a

ANOVA-repeated measures time effect