. Author manuscript; available in PMC: 2020 Apr 1.

Published in final edited form as: J Biol Rhythms. 2019 Feb 25;34(2):178–194. doi: 10.1177/0748730419828056

Table 3.

Post-hoc 1-sample t-test results comparing measured 1-h melatonin suppression values with the predicted CS model responses.

White light spectrum	Target CS	Mean ± SEM suppression after 1 h (%)	Predicted CS^a	Analysis
2700 K	0.07	2.5 ± 2.8	0.06	t₃₂ = −1.2, p = 0.23
	0.14	7.1 ± 2.6	0.11	t₃₂ = −1.5, p = 0.15
	0.30	17.0 ± 5.0	0.27	t₃₀ = −2.0, p = 0.06
	0.50	38.7 ± 3.9	0.45	t₃₀ = −1.6, p = 0.12
6500 K	0.07	4.8 ± 2.8	0.06	t₃₂ = −0.4, p = 0.67
	0.14	7.7 ± 3.0	0.11	t₂₈ = −1.1, p = 0.28
	0.30	28.1 ± 3.1	0.28	t₃₁ = 0.03, p = 0.98
	0.50	43.2 ± 3.1	0.46	t₃₀ = −0.9, p = 0.38

Note:

^(a)

Predicted CS values were calculated based upon the Rea et al. (Rea et al., 2005; Rea et al., 2012; Rea and Figueiro, 2018) model of circadian phototransduction (Equations 1 and 2) using the absolute spectral irradiance measurements from the spectrometer, undertaken during each study night to estimate the actual corneal light stimulus delivered to the participants.