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Table 6 Relative validity (RV) of measures in discriminating among smoking symptom groups, German and U.S current and former smokers

From: Evaluation of smoking-specific and generic quality of life measures in current and former smokers in Germany and the United States

Sample and measures

 

Smoking symptom frequency

F-ratio

RV

Scoringa

Noneb

A littlec

Somed

German Sample

 

(n = 91)

(n = 79)

(n = 9)

  

Smoking Impact

47.0 (4.4)

50.2 (5.8)

56.1 (12.3)

14.69**

1.00

SF-36 PCS

+

57.4 (4.4)

56.4 (4.2)

56.7 (4.4)

1.27

0.09

SF-36 MCS

+

54.4 (5.6)

54.4 (5.0)

50.0 (10.3)

2.60

0.18

US Sample

 

(n = 177)

(n = 74)

(n = 8)

  

Smoking Impact

47.6 (5.7)

56.4 (10.7)

61.0 (10.4)

43.26*

1.00

SF-36 PCS

+

54.3 (7.7)

52.0 (6.9)

52.9 (6.7)

2.43

0.06

SF-36 MCS

+

50.7 (9.5)

46.0 (11.7)

32.7 (14.7)

15.18*

0.35

  1. *p < 0.05
  2. aNegative (−) indicates higher score equals worse health; positive (+) indicates higher score equals better health
  3. bTotal score less than “A little of the time” on the symptom rating scale
  4. cTotal score between “A little of the time” and “Some of the time” on the symptom rating scale
  5. dTotal score at or above “Some of the time” on the symptom rating scale