All percentages should be reported as "1-in-XXX". The difference (in "certainty", not "risk") between 90% (1-in-10) and 95% (1-in-20) is the same as the differ

All percentages should be reported as "1-in-XXX". The difference (in "certainty", not "risk") between 90% (1-in-10) and 95% (1-in-20) is the same as the difference between 98% (1-in-50) and 99% (1-in-100).