| Level 1: | Yti = π0i + π1i*(CORTIDti) + π2i*(CORTIDti2) + eti |
| Level 2: | π0i = β00 + β01*(DAYi) + r0i |
| π1i = β10 + β11*(DAYi) + r1i | |
| π2i = β20 + β21*(DAYi) + r2i | |
| Level 3: | β00 = γ000 + u00 |
| β01 = γ010 | |
| β10 = γ100 | |
| β11 = γ110 | |
| β20 = γ200 | |
| β21 = γ210 |
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