4.2 Percentages and odds

In a study of how well emergency dispatchers recognised signs of stroke (Oostema et al. 2018), the data shown below were collected.

Sex of patients	Dispatcher suspected stroke	Dispatcher missed stroke
Male	67	43
Female	97	39

What percentage of male patients had their stroke symptoms missed by the dispatcher?

39.1% 60.9% 52.4% 33.3%
What percentage of female patients had their stroke symptoms missed by the dispatcher?

71.3% 47.6% 28.7% 33.3%
What are the odds that a male patients had their stroke symptoms missed by the dispatcher?

39.1 0.642 0.907 0.50
What are the odds that a female patients had their stroke symptoms missed by the dispatcher?

0.402 2.49 1.10 1.24
What is the odds ratio that a patients had their stroke symptoms missed by the dispatcher, comparing males to females?

0.63 0.402 0.50 1.6

References

Oostema JA, Chassee T, Reeves M. Emergency dispatcher stroke recognition: Associations with downstream care. Prehospital Emergency Care. 2018;22(4):466–71.