Table 4 Frequencies for data sources (1990–2013)
Questionnaire N | Diary N | Assay N (# specimens) | |
|---|---|---|---|
1990–1992 | 508 | 367 | NA |
1993 | 347 | 259 | NA |
1994 | 309 | 261 | NA |
1995 | 250 | 141 | NA |
1996 | 192 | 146 | NA |
1997 | 233 | 176 | 170 (1783) |
1998 | 205 | 162 | 167 (1820) |
1999 | 212 | 149 | 157 (1478) |
2000 | 190 | 103 | 106 (1036) |
2001 | 175 | 79 | 85 (340) |
2002 | 157 | 65 | 74 (279) |
2003 | 140 | 59 | 59 (236) |
2004 | 110 | 46 | 54 (208) |
2005 | 95 | 44 | 49 (179) |
2006 | 84 | 30 | NA |
2007 | 57 | 20 | NA |
2008 | 47 | 18 | NA |
2009 | 37 | 15 | NA |
2010 | 31 | 10 | NA |
2011 | 20 | 10 | NA |
2012 | 17 | 5 | NA |
2013 | 12 | 5 | NA |