The previous bhutaniZones table was introduced in the initial
calculator commit (61cf096, 2026-04-09) without any source citation
and was systematically ~0.5-1 mg/dL below the published Bhutani 1999
curves — borderline patients got pushed into the next-higher zone.
New values read directly from the Stanford Medicine Newborn Nursery
reproduction of Bhutani 1999 Figure 2:
https://med.stanford.edu/newborns/professional-education/jaundice-and-phototherapy/bhutani-nomogram.html
Uncertainty: ±0.3 mg/dL (values eyeballed from a 556 px rendered
graph, not a published table). This is called out explicitly in
both the in-code comment and the Bhutani tab footer, which also
points clinicians to the AAP 2022 tab for actual phototherapy
decisions.
Spot-check: 41h of life, TSB 9.7 mg/dL
Before: p75=9.33 → High-Intermediate Zone (wrong)
After: p75=10.1 → 9.7 below p75, above p40 → Low-Intermediate ✓
No interpolation or decision logic changed — only the lookup data
and its citation.
6db52eeec4