Table 1.
Number and distribution of serum samples per year, age group (in months) and region
| Variable | Category | 2005 | 2008 | 2009 | 2010 | 2011 | Total |
|---|---|---|---|---|---|---|---|
| Age | >12 | n.a. | n.a. | n.a. | 106 | 99 | 205 |
| ⩽12 | n.a. | n.a. | n.a. | 132 | 143 | 275 | |
| Unknown | n.a. | n.a. | n.a. | 12 | 28 | 40 | |
| Total | n.a. | n.a. | n.a. | 250 | 270 | 520 | |
| Region | South Sweden | 46 | 20 | 47 | 43 (23/18)* | 12 (8/3)* | 168 |
| Småland and the Islands | 19 | 121 | 63 | 45 (25/20)* | 51 (21/27)* | 299 | |
| West Sweden | 33 | 105 | 43 | 27 (16/10)* | 18 (17/1)* | 226 | |
| East Middle Sweden | 67 | 118 | 87 | 107 (46/54)* | 144 (70/60)* | 523 | |
| Stockholm | 3 | 5 | 8 | 27 (21/4)* | 28 (22/5)* | 71 | |
| North Middle Sweden | 12 | 0 | 0 | 1 (1/0)* | 0 | 13 | |
| Unknown | 10 | 0 | 0 | 0 | 17 (5/3)* | 27 | |
| Total | 190 | 369 | 248 | 250 | 270 | 1327 |
n.a., Not applicable.
*
Total number (⩽12 months/>12 months).