Rice finding 1844
Source evidence and comparison details for the Rice profile.
Husked (brown) rice · Inorganic arsenic (iAs) · 26 GEMS/Food submissions.
Selected finding and reference
26 GEMS/Food submissions. Basis: Dry-weight grain.
ND, 0 or "<x" with a limit = interval 0 to LOD (LOQ where LOD absent); HMI-calculated medians carry lower/upper bounds
HMI baseline position
High · HMI dry-grain iAs reference · 8 sampling families. Median as reported: 138 µg/kg. HMI median 96; Q1 70; Q3 106 µg/kg. 8 families. Not a safety grade.
Low is below Q1; Moderate includes Q1 through Q3; High is above Q3. Reporting bounds must give the same category throughout.
This finding’s sampling family contributes to the fixed reference.
Sensitivity to weighting
Equal subgroup weight within each family: High. The position is unchanged under this alternative. This check does not address all sampling, rounding or analytical uncertainty.
Sensitivity to source selection
- Without FDA rice survey (2013): High.
- Without Carey et al. (2020): High.
- Without WHO GEMS/Food: High.
- Without Houlihan et al. 2025: High.
- Without Meharg et al. 2009: High.
- Without Navaretnam et al. 2025: High.
- Without Signes-Pastor et al. 2016: High.
- Without Welna et al. 2018: High.
These checks show dependence on each sampling family; they are not confidence intervals.
Collection period
2007–2008
No year-by-year sample register is reconstructed from this summary.
Geographic scope
WHO EURO; unknown
Purchase or reporting market; growing origin not identified.
Sampling, analysis and reporting limits
per submitting laboratory; AnalyticalQAName retained.
ND, 0 or "<x" with a limit = interval 0 to LOD (LOQ where LOD absent); HMI-calculated medians carry lower/upper bounds
HMI-calculated descriptive summary of individual GEMS/Food submissions. Country identity is not exported; WHO region is a reporting region, not production origin. EURO and European Union labels can hold overlapping national submissions the export does not let us match.
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 |
|---|---|---|
| median | 26 of 26 quantified or detected; years 2007–2008 | mg/kg × 1000 = µg/kg; ug/kg unchanged |
primary/gemsfood-rice-records.csv rows for iAs, EURO, Husked (brown) rice, Dry-weight grain, Unknown.
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 dry-grain iAs reference · 8 sampling families. Dry-weight grain, µg/kg dry weight. Distribution of subgroup median concentration values.
| Reference (µg/kg) | Q1 | Median | Q3 |
|---|---|---|---|
| Primary HMI reference | 70 | 96 | 106 |
| Alternative weighting | 70 | 96 | 106 |
74 reference units; 8 sampling families. Counts describe evidence units, not independent studies or certainty.
| Contributing family | Reference units | Weight |
|---|---|---|
| FDA rice survey (2013) | 8 | 13% |
| Carey et al. (2020) | 29 | 12% |
| WHO GEMS/Food | 2 | 13% |
| Houlihan et al. 2025 | 16 | 13% |
| Meharg et al. 2009 | 4 | 13% |
| Navaretnam et al. 2025 | 1 | 13% |
| Signes-Pastor et al. 2016 | 13 | 12% |
| Welna et al. 2018 | 1 | 13% |
Methods
HMI calculates a pooled distribution of subgroup medians across the admitted sampling families. 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 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
- FDA rice survey (2013)
- Carey et al. (2020)
- WHO GEMS/Food
- Houlihan et al. 2025
- Meharg et al. 2009
- Navaretnam et al. 2025
- Signes-Pastor et al. 2016
- Welna et al. 2018
Reference version and interpretation
Frozen evidence selection: 2026-10-22. Method: hmi-pooled-reference-v2.
hmi-pooled-reference-v2:rice-dry-iAs:f14ec1f869e4
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.