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Table 2

Comparison of the Mann-Kendall and linear regression applied to annual fourth highest daily maximum 8-h level using data from a site at Harwell, UK. DOI: https://doi.org/10.1525/elementa.279.t2

Method

Time period

Number of valid years

Trend estimate (ppb/yr)

p-value

Lower 95% conf. limit (ppb/yr)

Upper 95% conf. limit (ppb/yr)

R² (%)

Mann-Kendall

1984–2013

–0.86

0.0005

–1.69

–0.36

regression

1984–2013

–0.92

0.0010

–1.42

–0.41

Method	Time period	Number of valid years	Trend estimate (ppb/yr)	p-value	Lower 95% conf. limit (ppb/yr)	Upper 95% conf. limit (ppb/yr)	R² (%)

Mann-Kendall	1984–2013	27	–0.86	0.0005	–1.69	–0.36	NA
regression	1984–2013	27	–0.92	0.0010	–1.42	–0.41	36

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