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Sample size per wave
| Year | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 |
|---|---|---|---|---|---|---|---|---|
| #nurses | 126 | 134 | 140 | 133 | 138 | 180 | 164 | 177 |
| Year | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 |
| #nurses | 198 | 173 | 312 | 270 | 285 | 253 | 283 | 252 |
| Year | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
| #nurses | 264 | 248 | 232 | 240 | 211 | 227 | 223 | 251 |
