Table 2. Characteristics of included peer reviewed studies.

Authors and year	Jurisdiction	Population	Amount of advance notice given to workers prior to work start time	Sleep and/or fatigue measures	Sleep and/or fatigue outcomes
Harknett, Schneider, and Wolfe (2020)	United States	Workers employed by large retail and food service firms	“How far in advance do you usually know what days and hours you will need to work at [EMPLOYER NAME]?” Responses categorised as “less than 1 wk,” “1–2 wk,” “2–3 wk,” “3–4 wk,” and “4 or more wk”	Four self-report questions. “During the past month, how would you rate your sleep quality overall?” (1=poor, 4=very good) “During the past month, how often did you have difficulty falling asleep?” (1=never, 2=1–2 times per month, 3=weekly, 4=multiple times per week, 5=every day) “During the past month, how often did you wake up repeatedly during sleep?” (1=never, 5=every day) “During the past month, how often did you wake up feeling exhausted/ fatigued?” (1=never, 5=every day)	Significantly better sleep quality with increased advance notice (p>0.05): • <1 wk notice: ref • 0.07 point increase in sleep quality with 1–2 wk notice • 0.07 point increase in sleep quality with 1–2 wk notice • 0.10 point increase in sleep quality with 2–3 wk notice • 0.14 point increase in sleep quality with 3–4 wk notice • 0.14 point increase in sleep quality with 4+ wk notice Significantly less difficulty falling asleep with increased advance notice (p>0.05): • <1 wk notice: ref • 0.10 point decrease in difficulty falling asleep with 1–2 wk notice • 0.12 point decrease in difficulty falling asleep with 2–3 wk notice • 0.16 point decrease in difficulty falling asleep with 3–4 wk notice • 0.17 point decrease in difficulty falling asleep with 4+ wk notice Significantly less sleep disturbance with increased advance notice (p>0.05): • <1 wk notice: ref • 0.09 point decrease in sleep disturbance with 1–2 wk notice • 0.09 point decrease in sleep disturbance with 2–3 wk notice • 0.14 point decrease in sleep disturbance with 3–4 wk notice • 0.17 point decrease in sleep disturbance with 4+ wk notice Significantly less waking up feeling fatigued with increased advance notice (p>0.05): • <1 wk notice: ref • 0.08 point decrease fatigue with 1–2 wk notice • 0.14 point decrease in fatigue with 2–3 wk notice • 0.18 point decrease in fatigue with 3–4 wk notice • 0.17 point decrease in fatigue with 4+ wk notice
Harknett, Schneider, and Irwin (2021)	United States	Seattle treatment group: Individuals who reported working in Seattle and whose employers were of the size and type that would be covered by the Secure Scheduling ordinance. Comparison group: Workers employed by the exact same set of companies covered by the Seattle law but employed in other large US cities	Seattle treatment group: >2 wk advance notice Comparison group: <2 wk advance notice	Percentage of respondents who reported ‘good’ or ‘very good’ sleep quality.	11% increase in ‘good’ or ‘very good’ sleep quality for Seattle treatment group when the Secure Scheduling ordinance was introduced. No increase in sleep quality for comparison group.
Schneider and Harknett (2019)	United States	Retail and food service workers employed at 80 large companies.	Amount of advance notice given of schedule: ·  0–2 d ·  3–6 d ·  1–2 wk ·  2 wk or more	Sleep quality rated as very good, good, fair, or poor used to create a dichotomous variable (very good and good versus fair and poor).	Significantly poorer sleep when 0–2 or 3–6 d’ notice given, as compared with 2 wk or more (ref). · 0.35 point decrease in sleep quality with 0–2 d’ notice* · 0.27 point decrease in sleep quality with 3–6 d’ notice* · 0.9 point decrease in sleep quality with 1–2 wk’ notice · More than 2 wk’ notice: ref