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Table 1 Age-interval of children by birth year with follow-up in 2008-2010

From: Use of hospital-based health care services among children aged 1 through 9 years who were born very preterm - a population-based study

Birth year Number of unique children entering into study   Follow-up in 2008-2010
2001 650      
   Age interval 6/7 7/8 8/9 9/10
   Person-years 318 648 648 327
2002 634      
   Age interval 5/6 6/7 7/8 8/9
   Person-years 313 630 629 318
2003 645      
   Age interval 4/5 5/6 6/7 7/8
   Person-years 323 643 641 317
2004 609      
   Age interval 3/4 4/5 5/6 6/7
   Person-years 302 607 606 302
2005 606      
   Age interval 2/3 3/4 4/5 5/6
   Person-years 292 606 604 312
2006 575      
   Age interval 1/2 2/3 3/4 4/5
   Person-years 285 571 568 284
2007 650      
   Age interval   1/2 2/3 3/4
   Person-years   651 643 314
2008 611      
   Age interval    1/2 2/3
   Person-years    612 303
2009 607      
   Age interval     1/2
   Person-years     297