Table 2. Summary of statistics on measured nitrification N₂O emission ratio.

	All data	Excluding outlier	Aggregated by paper
Sample no.	71	64	12
Mean (%)	1.922	0.426	5.167
Standard deviation (%)	5.702	0.526	10.526
Kurtosis (-)	15.255	1.191	0.498
Skewness (-)	4.006	1.369	1.549
Maximum (%)	29.445	2.320	28.234
75% quartile (%)	1.084	0.605	1.703
Median (%)	0.192	0.139	0.573
25% quartile (%)	0.053	0.048	0.063
Minimum (%)	0.006	0.006	0.011