Table 1.

The saliva and plasma DLMO from the literature across age groups

	0–9 years	10–19 years	20–29 years	30–39 years	40–49 years	50–59 years	60–69 years	70–79 years
Weighted mean saliva DLMO	20.02 ± 0.61 h	21.94 ± 1.20 h	21.60 ± 0.74 h	21.38 ± 0.68 h	20.97 ± 0.78 h	21.33 ± 0.46 h	20.96 ± 0.37 h	21.22 ± 0.40 h
Upper 95% CI	21.24 h	00.34 h	23.08 h	22.74 h	22.53 h	22.25 h	21.7 h	22.02 h
Lower 95% CI	18.80 h	19.54 h	20.12 h	20.02 h	19.41 h	20.41 h	20.22 h	20.42 h
# Studies	5	11	66	22	10	5	5	3
n	133	550	1875	450	252	133	82	104
Weighted mean plasma DLMO	—	—	22.15 ± 0.62 h	21.36 ± 0.57 h	21.54 ± 0.08 h	20.55 ± 1.64 h	21.43 ± 0.48 h	21.00 ± 0.43 h
# Studies	—	—	17	7	2	4	7	3
n	—	—	463	98	8	38	123	88

The data are the weighted means ± 1 SD for controls bundled into 10-year age groups based on the mean ages reported in the publications. Also shown are the upper and lower 95% confidence intervals. # studies indicate the number of publications used to generate the data. n = the total number of participants used in the publications.