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Table C.1.
Statistical comparison between local and high-z N/O populations.
| Property | Local Universe | High-z | Notes |
|---|---|---|---|
| Sample sizes | |||
| Total sample | 88,201 | 664 | Combined: 88,865 |
| 12 + log(O/H) < 8.1 | 234 | 121 | |
| 12 + log(O/H)≥8.1 | 87967 | 543 | |
| Raw log(N/O) distribution (no model correction) | |||
| Median (all) | −0.923 | −1.067 | Δ = +0.144 dex |
| Std. deviation | 0.195 | 0.226 | High-z more scattered |
| Metallicity-binned comparison | |||
| 12 + log(O/H) < 8.1 | |||
| Median residual | +0.03 | +0.35 | Δ = 0.32 dex |
| Bootstrap 95% CI | [0.27, 0.39] | Excludes zero | |
| MW / AD tests | p < 10−3 | Highly significant | |
| 12 + log(O/H)≥8.1 | |||
| Median residual | +0.001 | +0.134 | Δ = 0.13 dex |
| Bootstrap 95% CI | [0.111, 0.147] | Excludes zero | |
| MW / AD tests | p < 10−3 | Highly significant | |
Notes. Tests are computed both on the whole sample and in two metallicity bins 12+log(O/H) < 8.1, and 12+log(O/H) ≥8.1
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