. 2020 Jun 3;64(8):817–825. doi: 10.1093/annweh/wxaa055

Table 1.

1992–2017 SWORD data on number and estimated asthma cases, the annual incidence rate and trend over time.

	Number of actual (estimated^a) asthma cases	Annual average asthma incidence rate (95% CIs) per 100 000, per year	Annual average percentage change in asthma incidence (95% CIs)^b
Fish and shellfish processing	58 (190)	70 (48.9, 91.1)	−8.1 (−15.9, 0.4)
All other industries	4308 (9951)	2.9 (2.8, 3.1)	−7.0 (−7.8, −6.1)

^aChest physicians report voluntarily to SWORD for either 1 (randomly selected) month per year (‘sample’ reporters) or for 12 months a year (‘core’ reporters). ‘Actual’ = (‘sample’ cases + ‘core’ cases); ‘Estimated’ =12 × ‘sample’ cases, + ‘core’ cases.

^bTests for significance suggested that the two trends (fish and shellfish processing versus all other industries) were statistically different for asthma (P < 0.001).