Then, in a prospective study, the dipping/nondipping status of 43 subjects was assessed using ABP recorded over two 24-h periods of differing activity levels.
Data collection was performed over two 24-hour periods (each representing a patient "episode"), with patients contributing data to either one or both periods.
During pregnancy, pooled urine voids were collected over two 24-hour periods on a weekday and a weekend day.
We solicited a random subset of 36 participants for extensive ECG monitoring over two 24-hr periods on both a workday and a non-workday.
Daily energy intake (averaged over two 24-h food diaries) was measured during the baseline and intervention week (supplementary table 1).
From 1999 to 2006, we recruited 36 boilermakers at an apprentice welding school to participate in extensive ambulatory electrocardiogram (ECG) monitoring over two 24-hour periods on both a workday and a non-workday.
To characterize cyclic expression in C. reinhardtii, the expression profiles of 17,114 annotated C. reinhardtii genes were defined from samples taken at 3-hr intervals over two 24-hr time courses (see the section Materials and Methods).
The following measures were assessed at weeks 0 and 18: A 24-h diet recall was used to assess nutrient intake over two 24-h periods, using an online program (ASA24; Automated Self-Administered 24-hour Recall) developed by the National Cancer Institute, Bethesda, MD, USA (http://riskfactor.cancer.gov/tools/instruments/asa24/).
The following measures were assessed at baseline and week 18: A diet recall was used to assess nutrient intake over two 24-h periods at baseline and two 24-h periods at 18 weeks, using an online (Automated Self-administered 24-h Recall, ASA-24) program developed by the National Cancer Institute (Bethesda, MD, USA).
In order to assess activity related differences in exposure, prior to 20 weeks of pregnancy women were asked to collect all voids over two 24-hour periods (multiple spot urines) – once on a week day and again on a weekend day.
The assay was set up over two 96 well microplates.
