| 
      OHA: Oral Hypoglycemic Agents
        |  | Severe hypoglycemia | Symptomatic hypoglycemia |  
        |  | IR (95% CI) | IRR (95% CI) | IR (95% CI) | IRR (95% CI) |  
        | Overall | 0.09 (0.08-0.11)
 | - | 9.26 (8.81-9.73)
 | - |  
        | By gender |  |  |  |  |  
        | M | 0.06 (0.05-0.08)
 | 0.46 (0.35-0.62)
 | 7.77 (7.22-8.35)
 | 0.70 (0.63-0.77)
 |  
        | F | 0.14 (0.12-0.16)
 | 1.00 (RC)
 | 11.08 (10.35-11.86)
 | 1.00 (RC)
 |  
        | By age classes |  |  |  |  |  
        | <65 | 0.07 (0.05-0.09)
 | 1.00 (RC)
 | 8.91 (8.24-9.63)
 | 1.00 (RC)
 |  
        | 65-74 | 0.10 (0.08-0.13)
 | 1.50 (1.07-2.11)
 | 9.23 (8.52-10.00)
 | 1.04 (0.93-1.16)
 |  
        | >=75 | 0.15 (0.12-0.20)
 | 2.30 (1.60-3.31)
 | 9.89 (8.85-11.05)
 | 1.11 (0.97-1.27)
 |  
        | By diabetes duration |  |  |  |  |  
        | <=2 | 0.02 (0.01-0.05)
 | 1.00 (RC)
 | 4.63 (3.75-5.72)
 | 1.00 (RC)
 |  
        | 2-5 | 0.08 (0.06-0.12)
 | 3.66 (1.42-9.47)
 | 6.63 (5.76-7.63)
 | 1.43 (1.11-1.85)
 |  
        | 5.1-10 | 0.06 (0.04-0.09)
 | 2.66 (1.03-6.88)
 | 7.38 (6.59-8.27)
 | 1.60 (1.26-2.03)
 |  
        | >10 | 0.14 (0.12-0.17)
 | 6.30 (2.58-15.38)
 | 11.90 (11.15-12.69)
 | 2.57 (2.06-3.21)
 |  
        | By cardiac/cerebrovascular disease |  |  |  |  |  
        | NO | 0.10 (0.09-0.12)
 | 1.16 (0.79-1.70)
 | 8.7 (8.22-9.21)
 | 0.74 (0.65-0.83)
 |  
        | YES | 0.09 (0.06-0.12)
 | 1.00 (RC)
 | 11.83 (10.67-13.13)
 | 1.00 (RC)
 |  
        | By glucose lowering therapy schemes |  |  |  |  |  
        | OHA (without secretagogues)
 | 0.04 (0.03-0.06)
 | 1.00 (RC)
 | 5.57 (4.98-6.22)
 | 1.00 (RC)
 |  
        | OHA (with secretagogues)
 | 0.08 (0.06-0.11)
 | 2.00 (1.24-3.21)
 | 9.50 (8.64-10.45)
 | 1.71 (1.48-1.98)
 |  
        | Insulin (basal oral)
 | 0.10 (0.06-0.17)
 | 2.49 (1.31-4.73)
 | 10.76 (9.01-12.85)
 | 1.93 (1.57-2.38)
 |  
        | Insulin (basal bolus)
 | 0.29 (0.23-0.35)
 | 6.91 (4.52-10.56)
 | 18.36 (16.79-20.08)
 | 3.30 (2.86-3.80)
 |  
        | Insulin (Other schemes)
 | 0.13 (0.08-0.19)
 | 3.02 (1.70-5.36)
 | 14.55 (12.64-16.75)
 | 2.61 (2.19-3.13)
 |  
        | Diet | 0 | - | 1.60 (1.10-2.34)
 | 0.29 (0.19-0.43)
 |  RC: Reference Class
 IR: Incidence Rate
 95% CI: 95% Confidence Interval
 IRR: Incidence Rate Ratio
 |