. Author manuscript; available in PMC: 2020 Aug 6.

Published in final edited form as: J Biol Rhythms. 2019 Apr 24;34(3):323–331. doi: 10.1177/0748730419844650

Table 2.

Measures of sleep and wrist activity (median, quartile 1, quartile 3) before and during pregnancy in women (N=39). Superscripted letters indicate differences between prepregnancy

Work Days without daylight saving adjustment	Prepregnancy	Trimester 1	Trimester 2	Trimester 3
Sleep Onset (Local time)	10:16 (9:52,10:31) PM ^B,C	9:52 (9:24,10:30) PM ^A,D	9:58 (9:27,10:31) PM ^A,D	10:14 (9:53,10:37) PM ^B,C
Total Activity (Counts x 10³)	269.1 (207.5,304.1) ^B,C,D	230.0 (168.3,263.7) ^A	206.5 (177.1,269.8) ^A	227.4 (175.5,260.5) ^A
Work Days with daylight saving adjustment	Prepregnancy	Trimester 1	Trimester 2	Trimester 3
Sleep Onset (Standard time)	9:28 (9:13,9:57) PM ^B	9:18 (8:48,9:50) PM ^A,D	9:22 (8:42,9:51) PM ^D	9:34 (9:06,10:15) PM ^B,C
Total Activity (Counts x 10³)	269.1 (207.5,304.1) ^B,C,D	230.0 (168.3,263.7) ^A	206.5 (177.1,269.8) ^A,B	227.4 (175.5,260.5) ^A

, first trimester

, second trimester

and third trimester

(Wilcoxon Rank Sum test, P < 0.05).