Table 2

Incidence rate of diseases and occupational injuries by the seafarer rank from 2016 to 2019 (n=379)

Medical events	Officer			Non-officer			IRR*	95% CI	P value
Medical events	No	Rate	95% CI	No	Rate	95% CI	IRR*	95% CI	P value
Disease types
Gastrointestinal	13	3.07	1.64 to 5.24	49	6.51	4.82 to 8.59	2.12	1.13 to 4.26	0.011†
Musculoskeletal	10	2.14	1.03 to 3.94	40	4.82	3.45 to 6.56	2.25	1.11 to 5.05	0.016†
Cardiovascular	10	2.69	1.29 to 4.95	29	4.39	2.95 to 6.31	1.63	0.77 to 3.75	0.179
Non-specific	12	2.86	1.47 to 4.99	20	2.68	1.64 to 4.14	0.94	0.44 to 2.10	0.849
Respiratory	11	2.59	1.29 to 4.63	17	2.25	1.31 to 3.60	0.87	0.38 to 2.05	0.711
Dermatological	4	0.88	0.24 to 2.25	26	3.22	2.10 to 4.71	3.66	1.27 to 14.42	0.007†
Genitourinary	10	2.06	0.99 to 3.78	11	1.27	0.64 to 2.28	0.62	0.24 to 1.63	0.280
Eye/adnexa	6	1.31	0.48 to 2.86	10	1.23	0.59 to 2.27	0.94	0.31 to 3.14	0.887
Infectious and parasitic	5	1.26	0.40 to 2.94	4	0.57	0.15 to 1.45	0.45	0.09 to 2.09	0.250
Ear/Mastoid	2	0.41	0.05 to 1.49	4	0.46	0.13 to 1.19	1.13	0.16 to 12.44	0.927
Neurological‡	—	—	—	4	0.46	0.13 to 1.19	—	—	N/A
Mental/behavioural	1	0.21	0.005 to 1.14	3	0.35	0.07 to 1.02	1.69	0.14 to 88.59	0.713
Injury location
Wrist/hand	8	1.72	0.74 to 3.38	16	1.93	1.11 to 3.14	1.13	0.45 to 3.03	0.801
Knee/lower leg	2	0.44	0.05 to 1.57	15	1.84	1.03 to 3.03	4.20	1.01 to 38.01	0.032†
Head/eye	3	0.76	0.16 to 2.21	6	0.85	0.31 to 1.85	1.13	0.24 to 6.95	0.898
Lower back/lumbar spine	3	0.77	0.16 to 2.25	5	0.73	0.24 to 1.69	0.94	0.18 to 6.07	0.911
Thorax/neck	1	0.21	0.005 to 1.14	6	0.69	0.25 to 1.51	3.37	0.41 to 155	0.261
Skin burns	1	0.21	0.005 to 1.14	5	0.58	0.19 to 1.35	2.81	0.31 to 133	0.369
Upper arm/shoulder	1	0.27	0.006 to 1.53	3	0.46	0.09 to 1.35	1.69	0.14 to 88.6	0.710
Elbow/forearm‡	—	—	—	4	0.46	0.13 to 1.18	—	—	N/A

*IRR calculated as the rate of non-officer/rate of officer.
†Significant at *p<0.05.
‡Dashes indicate no case or the rate or the comparison that was not performed.
IRR, incidence rate ratio; N/A, not applicable.