Association between influenza vaccination coverage and patient’s characteristics among patients with diabetes mellitus in the Italian area of Udine, from 1 October to 31 December 2017 (multivariate log binomial regression analysis)
| RR | 95% CI | P value | |
| Sex | |||
| Female | 1.00 | – | – |
| Male | 1.05 | 1.02 to 1.08 | <0.001 |
| Age category (years) | |||
| <18 | 0.25 | 0.11 to 0.59 | 0.001 |
| 18–64 | 1.00 | – | – |
| 65–74 | 2.25 | 2.13 to 2.37 | <0.001 |
| 75–84 | 2.64 | 2.50 to 2.78 | <0.001 |
| ≥85 | 2.86 | 2.70 to 3.03 | <0.001 |
| HbA1c | |||
| None in 365 days | 1.00 | – | – |
| <42 mmol/mol | 1.15 | 1.08 to 1.22 | <0.001 |
| 42–48 mmol/mol | 1.21 | 1.16 to 1.26 | <0.001 |
| 48–53 mmol/mol | 1.19 | 1.14 to 1.24 | <0.001 |
| 53–64 mmol/mol | 1.15 | 1.11 to 1.20 | <0.001 |
| ≥64 mmol/mol | 1.11 | 1.06 to 1.17 | <0.001 |
| Prescribed medications | |||
| None in 2017 | 0.94 | 0.91 to 0.98 | 0.004 |
| I | 1.02 | 0.98 to 1.07 | 0.35 |
| M | 1.00 | – | – |
| O | 0.96 | 0.91 to 1.01 | 0.14 |
| IM | 1.05 | 0.99 to 1.12 | 0.07 |
| IO | 0.98 | 0.90 to 1.08 | 0.75 |
| MO | 0.98 | 0.95 to 1.02 | 0.36 |
| IMO | 1.07 | 1.01 to 1.14 | 0.022 |
| Latency from diagnosis | |||
| ≤1 year | 1.00 | – | – |
| >1 and ≤5 years | 1.15 | 1.08 to 1.23 | <0.001 |
| >5 and≤10 years | 1.13 | 1.06 to 1.20 | <0.001 |
| >10 years | 1.21 | 1.15 to 1.29 | <0.001 |
HbA1c, glycated haemoglobin; I, insulin only; IM, insulin and metformin; IMO, insulin, metformin and other oral antidiabetic medications; IO, insulin and other oral antidiabetic medications; M, metformin only; MO, metformin and other oral antidiabetic medications; O, other oral antidiabetic drugs only; RR, relative risk.