Rice finding 1304
Source evidence and comparison details for the Rice profile.
Cooked rice (total diet study composite) · Lead (Pb) · Sample count unreported.
Selected finding and reference
Sample count unreported. Basis: cooked as eaten.
<LOD values substituted with 1/2 LOD by the authors (LOD not reported); mean may include substituted values
HMI baseline position
Limited data · HMI cooked-rice Pb reference · 3 sampling families. Mean as reported: 4.8 µg/kg. HMI median ≤4; Q1 ≤4; Q3 ≤5.21 µg/kg. 3 families. Reporting bounds prevent a rating.
Reporting bounds or insufficient reference spread prevent a stable Low / Moderate / High classification.
This is an external comparison; the finding does not set the reference.
Sensitivity to weighting
Equal subgroup weight within each family: Limited data. The position remains unresolved under this alternative. This check does not address all sampling, rounding or analytical uncertainty.
Sensitivity to source selection
- Without FDA Total Diet Study, FY2018–FY2020: Limited data.
- Without WHO GEMS/Food: Limited data.
- Without Baxter et al. 2015: Limited data.
These checks show dependence on each sampling family; they are not confidence intervals.
Collection period
Collection date unreported
No year-by-year sample register is reconstructed from this summary.
Geographic scope
Songhua River Area
Sampling site within one study.
Sampling, analysis and reporting limits
ICP-MS (Thermo X-Series 2) after high-pressure HNO3 digestion.
<LOD values substituted with 1/2 LOD by the authors (LOD not reported); mean may include substituted values
Shared samples and study overlap
Subgroup rows, statistics of the same subgroup and the study total share samples; they are not independent results.
Each table row describes a food/analyte result. Repeated rows do not add independent samples or datasets. No cross-study trend is calculated in this comparison mode.
Reported values, conversion and source locator
| Source statistic | Original result | Displayed unit conversion |
|---|---|---|
| mean | Rice Songhua River Area 0.0048 | mg/kg x 1000 |
Table 2, Cereals and cereal products, Rice row, Pb mg/kg Songhua River Area column; p.5.
No moisture, cooking-yield or species conversion is applied to the original finding above. Any basis conversion used for its HMI comparison is stated separately with the numerical target.
Open the primary publication · HMI source record
Reference and scope
HMI cooked-rice Pb reference · 3 sampling families. Cooked rice as prepared, µg/kg as eaten. Distribution of sample or subgroup median concentration values.
| Reference (µg/kg) | Q1 | Median | Q3 |
|---|---|---|---|
| Primary HMI reference | ≤4 | ≤4 | ≤5.21 |
| Alternative weighting | ≤4 | ≤4 | ≤5.21 |
83 reference units; 3 sampling families. Counts describe evidence units, not independent studies or certainty.
| Contributing family | Reference units | Weight |
|---|---|---|
| FDA Total Diet Study, FY2018–FY2020 | 54 | 33% |
| WHO GEMS/Food | 28 | 33% |
| Baxter et al. 2015 | 1 | 33% |
Methods
HMI pools subgroup medians from every compatible rice sampling family in the evidence ledger for this analyte, material and basis: published subgroup medians, medians HMI calculates from printed per-sample values, FDA Total Diet Study cooked composites and WHO GEMS/Food region-by-year medians (random sampling only). Each family has equal total weight; subgroups have equal weight within a family. Non-detects stay as zero-to-limit intervals, so quartiles carry lower and upper bounds. Means, ranges and maxima never enter as observations. Dry-weight, native-moisture and cooked results are kept in separate references; no moisture conversion is assumed.
Inverse weighted empirical CDF; midpoint at exact cumulative-weight boundaries. At least four reference units and a definitely positive Q1–Q3 spread are required. This is a display eligibility rule, not statistical validation.
Limitations
An evidence-library reference, not a probability sample of the world rice market. Sampling families differ in frame (retail, farm, contaminated sites, monitoring) and period; GEMS/Food regions are reporting regions, not growing origins. Many submissions are non-detects with differing limits, which widens the bounds. A position is descriptive concentration, not a safety or compliance judgment.
Admitted source families
Reference version and interpretation
Frozen evidence selection: 2026-10-22. Method: hmi-pooled-reference-v2.
hmi-pooled-reference-v2:rice-cooked-Pb:7a8e8b537b1c
The reference is computed by HMI from admitted evidence, not copied from a study baseline. It describes the evidence currently in this scope; it is not a worldwide or current-lot benchmark. Source, year and region filters do not change it. Different HMI scopes are not one common ranking.