Background
Methods
Comparison of CAT and SGRQ scores
Rasch analysis
Scoring the CAT
CAT score | CAT logits |
---|---|
0 | -4.31 |
5 | -1.90 |
10 | -1.03 |
15 | -0.43 |
20 | 0.07 |
25 | 0.55 |
30 | 1.07 |
35 | 1.82 |
40 | 4.01 |
Scoring the SGRQ
Mapping CAT scores to SGRQ items
Patients
Results
CAT categories within a COPD population
Correlation with SGRQ
Creation of CAT scenarios
Low Impact (CAT 1-10) | Medium Impact (CAT 11-20) | High Impact (CAT 21-30) | Very High Impact (CAT 31-40) |
---|---|---|---|
Breathless several days a week (-3.86) | Housework takes long or stop for rests (-0.91) | Chest causes lot of problems or most important problem (0.15) | Cough causes tiredness (1.13) |
Breathless walking up hills (-3.72) | Breathless most days a week (-0.80) | 3 or more attacks of chest trouble in last year (0.20) | Takes a long time to get washed or dressed (1.24) |
Difficult to carry heavy loads, etc (-3.16)
| Bring up phlegm several days a week
(-0.77)
| Get afraid/panic when can't get breath
(0.21)
| Breathless walking around home
(1.47)
|
Have to stop/slow down if hurry/walk fast
(-2.98)
| Wheezing attacks only with chest infections
(-0.68)
| Breathless walking on level ground outside the house
(0.32)
| Chest trouble is a nuisance to family, friends (1.49)
|
Chest condition causes a few problems
(-2.91)
| Cough several days a week
(-0.64)
| Wheezing attacks several days a week
(0.36)
| Cannot take bath/shower or takes long time (1.55)
|
Difficult to walk up hill, light gardening, etc
(-2.64)
| Wheezing attacks a few days a month
(-0.35)
| Cough and/or breathing embarrassing in public
(0.47)
| Cannot go out for entertainment (1.87)
|
Most days are good in average week
(-2.63)
| 1-2 attack of chest trouble in last year
(-0.30)
| Cough and/or breathing disturbs sleep
(0.49)
| Coughs hurts (2.11)
|
Stops 1 or 2 things
(-2.15)
| Bring up phlegm most days a week
(-0.21)
| Feel not in control of chest problem (0.49)
| Cannot do housework
(2.20)
|
Breathless walking up a flight of stairs
(-2.15)
| A few good days in an average week
(-0.19)
| Wheezing attacks most days a week
(0.58)
| Have become frail or invalid because of chest (2.42)
|
Cough only with chest infections
(-2.06)
| Cough most days a week
(-0.09)
| Stops patient doing most things they want to do (0.60)
| Cannot go out of house for shopping
(2.69)
|
Walk slower than others or stop for rests
(-1.52)
| Breathless when bending over
(-0.07)
| Breathless getting washed/dressed (0.62)
| Stops patient doing everything they want to do (3.11)
|
Breathless only with chest infections
(-1.52)
| Wheeze worse in morning
(-0.02)
| No good days in average week (0.63)
| Cannot move far from bed or chair (3.40)
|
Get exhausted easily
(-1.47)
| Breathless when talking
(0.81)
| ||
Walk slowly or stop walking one flight of stairs
(-1.14)
| Exercise felt not to be safe
(0.92)
| ||
Bring up phlegm only with chest infections
(-1.07)
| Everything seems too much of an effort
(0.92)
| ||
Usually cannot play sports or games
(-1.05)
|
COPD ladder of severity
CAT score | Descriptions |
---|---|
40 | Cannot move far from bed or chair Have become frail or an invalid Cannot do housework |
35 | Cannot take bath/shower or takes a long time Breathless walking around the home Chest trouble has become a nuisance to friends/relatives |
30 | Everything seems too much of an effort No good days in the week Stops patient doing most of what they want to do |
25 | Feel that not in control of chest problem Cough/breathing disturbs sleep Get afraid or panic when cannot get breath |
20 | Wheeze worse in the morning Breathless on bending over Wheezing attacks on most days |
15 | Cough several days a week Breathlessness on most days Housework takes a long time or have to take rests |
10 | Usually cannot play sports or games Gets exhausted easily Walk slower than other people or stop for rests |
5 | Breathlessness stops patient doing one or two things Chest condition causes a few problems Breathless walking up hills |