. Author manuscript; available in PMC: 2017 Jul 1.

Published in final edited form as: Sleep Biol Rhythms. 2016 Jan 5;14(3):249–255. doi: 10.1007/s41105-015-0046-2

Table 2.

Correlations among maternal and infant light and activity.

		Maternal Light: Maternal Activity			Infant Light: Maternal Light			Infant Activity: Infant Light			Infant Activity: Infant Light Controlling Maternal Activity
		4 wk	8 wk	12 wk	4 wk	8 wk	12 wk	4 wk	8 wk	12 wk	4	8	12
Timing	Acroph ase	.717 ^**	.746 ^**	.688 ^*	.422 ^**	.439 ^**	.693 ^**	.38 5^*	.493 ^**	.686 ^**	.17 7	− .04 3	.491 ^**
	M10 midpoi nt	.532 ^**	.367 ^*	.453 ^*	.674 ^**	.611 ^**	.631 ^**	.28 2	.243	.731 ^**	.11 8	.01 8	.662 ^**
	L5 midpoi nt	.465 ^**	.781 ^**	.651 ^**	.763 ^**	.332 ^*	.399 ^**	.25 9	.241	.337 ^*	.15 3	.17 8	.338 ^*
Amplit ude	Amplitu de	.137	.279	.277	.570 ^**	.723 ^**	.559 ^**	.30 3^*	.256	.460 ^**	.25 5	.24 5	.464 ^**
	Magnit ude	.105	.240	.277	.535 ^**	.664 ^**	.593 ^**	.27 9	.205	.402 ^**	.24 8	.19 3	.403 ^**
24 hr fit	R²	.186	.110	.322 ^*	.380 ^*	.526 ^**	.516 ^**	.20 7	.138	.377 ^*	.23 1	.12 3	.347 ^*
Center	Mesor	.112	.275	.364 ^*	.523 ^**	.694 ^**	.502 ^**	.15 3	.324 ^*	.384 ^*	.14 7	.32 0^*	.380 ^*
	Midleve l	− .023	.044	.126	.516 ^**	.686 ^**	.553 ^**	.07 5	.342 ^*	.322	.09 5	.34 3^*	.296
	M10 Value	.106	.181	.275	.549 ^**	.728 ^**	.562 ^**	.26 5	.399 ^*	.458 ^**	.24 7	.39 8^*	.448 ^*
	L5 Value	.170	.371 ^*	.009	.406 ^**	.462 ^**	.333 ^*	− .22 5	.160	− .082	− .24 4	.14 6	− .073
Regular ity	IS	.160	.103	.427 ^*	.312 ^*	.519 ^**	.483 ^**	.06 6	.232	.386 ^*	.16 4	.19 9	.378 ^*
	IV	.245	.193	.164	.211	.501 ^**	.214	.21 1	.170	.119	.25 4	.04 8	.130

Note: 4 wk, n = 44; 8 and 12 wk, n = 43

Cosinor – Acrophase, Magnitude, Mesor, R²

NPCRA – M10 midpoint, L5 midpoint, Amplitude, Midlevel, M10 value, L5 value, inter-daily stability (IS), intra-daily variability (IV)

p < .05,

^**

p < .01