The previous LMS table (L rounded to 2 decimals, ~0 near term) underfit
the skew of Fenton 2013 and drifted ~0.05 z-score units from peditools
and Epic at term. Worst-case this could push borderline infants across
the SGA/AGA cutoff — 10th percentile ≈ z = -1.28, a 0.05-SD drift is
enough to flip the classification.
New LMS: empirically fit against 6 probe weights per week at
peditools.org/fenton2013 (widely-used Fenton 2013 calculator). Validated
across all 21 weeks × both sexes × 5 weights per case (210 cases) —
every one agrees with peditools within 0.01 z-score units, mean
difference 0.002.
Example — 40 5/7 wk male, 3070 g:
BEFORE: z = -1.38 (matched only one of three external sources)
AFTER: z = -1.42 (matches Epic -1.43 and third-source -1.44)
Peditools at integer 40w: z = -1.10 (exact match with new table at
integer-week input)
LMS fit RMSE < 0.005 z-score units per week; see commit message for the
back-solve methodology.
Split the Bedside clinical reference section out of calculators.js
(~1220 lines) into 20 focused ES modules under public/js/bedside/.
Each module owns one clinical topic (cardiac, seizure, sepsis, burns,
etc.) and exports an init() wired up by bedside/index.js. Shared
helpers live in shared.js and also set window._EM for back-compat
with the 4 remaining call sites in calculators.js.
Load order: classic defer calculators.js first, then module script
bedside/index.js. Handlers bind at DOM-ready; runtime _EM lookups
resolve after both are evaluated.
Makes bedside content editable per-section, shrinks calculators.js
from 4111 to 2891 lines, and keeps the existing Playwright smoke
suite (e2e/tests/bedside-smoke.spec.js) as the behavioral contract.
