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. Author manuscript; available in PMC: 2022 Feb 1.
Published in final edited form as: Psychoneuroendocrinology. 2020 Nov 17;124:105067. doi: 10.1016/j.psyneuen.2020.105067
Level 1

[within-individual, within-day]
LNCORTISOLijk = π0ijk+ π 1ijk*TSWijk + π2ijk*CLOCKTIMEijk +eijk
Level 2

[day-level, within-individual]
π 0jk00k01k*LABDAY02k+r0jk
π 1jkTSW10k11k*LABDAY12k+r1jk
π 2Jk=β20k21k*SCHOOLDAY22k [fixed]
π 3jkTSW30k31k*SCHOOLDAY32k [fixed]
π 4jkCLOCKTIME40k [fixed]
Level 3

[between-individuals]
β00kLNCORTISOL intercept000+u00k
β01kLABDAY intercept010 [fixed]
β02kSCHOOLDAY intercept020 [fixed]
β10kLNCORTISOL slope100+u10k
β11kLABDAY slope110 [fixed]
β12kSCHOOLDAY slope120 [fixed]
β20kCLOCKTIME200 [fixed]

Note: Above is the depiction for the LABDAY cortisol model (controlling on SCHOOLDAY). A parallel model examining SCHOOLDAY (controlling on LABDAY) was also examined. LNCORTISOL variables reflect level of cortisol on days participants were at their homes.