Table 4 Responsiveness of OIDP: mean OIDP in 2007 and 2012 by change scores of reference variables in Norway (n = 2947) and Sweden (n = 4862)

Norway

OIDP 2007

9.9 (4.3)

8.9 (3.1)

10.8 (5.4)

OIDP 2012

11.5 (5.8)

8.9 (3.2)

9.5 (3.9)

2007 versus 2012

p = 0.001^a

p = 0.792^a

p = 0.001^a

0.946 p = 0.001^b

Sweden

OIDP 2007

9.4 (3.9)

9.2 (3.7)

10.9 (5.8)

OIDP 2012

9.9 (4.5)

8.8 (3.0)

8.8 (2.9)

2007 versus 2012

p = 0.001^a

p = 0.000^a

p = 0.000^a

0.952 p = 0.001^b

Satisfaction with tooth appearance

Worsened Mean (sd) ^c

Stable Mean (sd) ^d

Improved Mean (sd) ^e

Norway

OIDP 2007

9.7 (3.9)

9.1 (3.4)

10.7 (5.1)

OIDP 2012

11.6 (6.0)

9.1 (3.4)

9.3 (3.1)

2007 versus 2012

p = 0.001^a

p = 0.987^a

p = 0.001^a

0.935 p = 0.001^b

Sweden

OIDP 2007

9.2 (3.5)

9.2 (3.6)

10.8 (5.6)

OIDP 2012

9.8 (4.6)

8.8 (2.9)

8.9 (3.1)

2007 versus 2012

p = 0.002^a

p = 0.000^a

p = 0.000^a

0.963 p = 0.001^b

Tooth loss

Lost teeth Mean (sd) ^c

Stable all teeth Mean (sd) ^d

Stable tooth loss Mean (sd) ^e

Norway

OIDP 2007

9.8 (3.6)

8.5 (1.8)

12.8 (6.8)

OIDP 2012

10.6 (4.4)

8.5 (1.7)

12.6 (6.9)

2007 versus 2012

p = 0.032^a

p = 0.916^a

p = 0.243^a

0.997 p = 0.05^b

Sweden

OIDP 2007

9.4 (3.3)

8.6 (2.0)

12.1 (6.9)

OIDP 2012

9.5 (3.7)

8.3 (1.3)

10.9 (5.9)

2007 versus 2012

p = 0.690^a

p = 0.000^a

p = 0.000^a

0.988 p = 0.001^b