(b)  

Fish	Ethnicity	Age	Follow-up years	Fish type	Fish consumption	Number of participants	Quartile	Adjustment for T2D risk factors	Quality score	Adjusted RR (95% CI)
Nanri et al. 2011A	Japan	40–59	10	Fresh fish	95.4 g/d versus 13.6 g/d (81.8 g/d)	52680	4	Age, BMI, family history of diabetes mellitus, physical activity, vegetable, fruit, and meat	11	0.91 (0.73–1.13)
Villegas et al. 2011B	China	40–74	4.1–8.9	Fish	79.6 g/d versus 9.6 g/d (70 g/d)	116156	5	Age, BMI, physical activity, family history of diabetes, and dietary pattern (vegetable, fruit, and meat)	11	0.90 (0.80–1.01)
Kaushik et al. 2009G	US	26–78	14.5–18.5	Finfish	>71.43 g/d versus <3.3 g/d (78.57 g/d)	195204	5	Physical activity, family history of diabetes, and BMI	7	1.22 (1.08–1.38)
Montonen et al. 2005J	Finland	40–69	23	Total fish	>0 versus 0 g/d	4304	4	Age, BMI, and family history of diabetes	6	0.96 (0.71–1.29)
Patel et al. 2009C	Norwich, England	40–79	7.5	White fish, oily fish	>14.28 g/d versus <14.28 g/d (14.28 g/d)	21984	2	Age, BMI, family history of diabetes, and physical activity	7	0.90 (0.79–1.03)
Patel et al. 2012K	Europe	55–63	6.9	Total fish	>34.9 g/d versus <2.9 g/d	24813	4	Age, BMI, physical activity, fruit, and vegetable intake	8	1.06 (0.92–1.22)
Van Woudenbergh et al. 2009H	Dutch	>55	12	Lean fish, fatty fish	46.3 g/d versus 0 (46.3 g/d)	4472	4	Age	5	1.16 (0.89–1.51)