Table 2.
Absolute values and trends of WND incidence in Astrakhan, Volgograd, and Rostov Provinces, Southern Russia, from 1997 to 2013.
| Astrakhan Province | Volgograd Province | Rostov Province | ||||
|---|---|---|---|---|---|---|
| Year | WND incidence per 100,000 population | Classifi-cation of changes in WND incidence | WND incidence per 100,000 population | Classifi-cation of changes in WND incidence | WND incidence per 100,000 population | Classifi-cation of changes in WND incidence |
| 1997 | 0.80 | > 0.19 | 0? | |||
| 1998 | 0.90 | Stability * | > 1.31 | Increase? | 0? | |
| 1999 | 9.50 | Increase | > 14.3 | Increase | 0? | |
| 2000 | 3.70 | Decrease | 1.20 | Decrease | 0.11 | Increase? |
| 2001 | 4.90 | Increase | 0.56 | Decrease | 0.11 | Stability |
| 2002 | 3.70 | Decrease | 0.53 | Stability | 0.00 | Decrease |
| 2003 | 1.20 | Decrease | 0.00 | Decrease | 0.05 | Increase |
| 2004 | 2.60 | Increase | 0.00 | Stability | 0.16 | Increase |
| 2005 | 7.30 | Increase | 0.11 | Stability | 0.37 | Increase |
| 2006 | 1.41 | Decrease | 0.45 | Stability | 0.30 | Decrease |
| 2007 | 3.32 | Increase | 2.40 | Increase | 0.44 | Increase |
| 2008 | 0.10 | Decrease | 0.08 | Decrease | 0.02 | Decrease |
| 2009 | 0.30 | Stability | 0.19 | Stability | 0.02 | Stability |
| 2010 | 1.19 | Increase | 15.92 | Increase | 1.39 | Increase |
| 2011 | 1.78 | Increase | 2.34 | Decrease | 0.37 | Decrease |
| 2012 | 7.11 | Increase | 8.07 | Increase | 1.12 | Increase |
| 2013 | 6.03 | Decrease | 1.85 | Decrease | 0.19 | Decrease |
| Mean, 2001–2012 | 2.91 | 2.55 | 0.36 | |||
* The rules for classification of WND incidence changes as “decrease”, “stability” and “increase” are given in the Methods; ? The data obtained from official publications were considered not reliable and were not used below.