unnamed source
- mortality on the middle passage was eight per cent eight per cent between 1st July 1827 and 31st December 1830 ⟨during legal slave imports to Rio Janeiro⟩
the mortality on the middle passage was _only eight per cent._
judge verdicts (4)
- groundedness 1.00 pass — The claim is directly stated in the passage. The passage explicitly says 'the mortality on the middle passage was _only eight per cent._' for the 150,587 slaves legally imported into Rio Janeiro between 1st July 1827 and 31st December 1830, matching all elements of the claim including the specific timeframe and context.
- qualifier_fidelity 0.60 fail — The viewpoint qualifier is incorrect. The passage does not attribute this mortality statistic to the author; rather, it is presented as factual data about the 150,587 slaves legally imported during the specified period. The viewpoint should be 'unnamed source' or the data should be attributed more precisely to the historical record being cited, not to 'author'. The quote is accurate and the time period, context, and other qualifiers are faithful to the passage.
- groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly states 'out of 150,587 slaves legally imported into Rio Janeiro between the 1st July, 1827, and 31st December, 1830, when it became a smuggling trade, the mortality on the middle passage was _only eight per cent._' This matches the claim's subject, predicate, object, and time period precisely.
- qualifier_fidelity 0.90 pass — The claim is largely faithful to the passage. The quote appears verbatim and supports the claim. The time period is correctly specified as 1st July 1827 to 31st December 1830, matching the passage. The context correctly identifies this as during legal slave imports to Rio Janeiro. The perspective (unnamed source, neutral stance, assertive framing) is appropriate as the passage presents this as factual information. One minor observation: the passage uses 'only eight per cent' with emphasis (underscore), which subtly implies an interpretive judgment about the mortality rate being surprisingly low in context, though the claim's 'neutral' sentiment still reasonably captures this as a factual statement.