Table 3

Reliability estimates on demographic, health risk factors and co-morbidity of people aged 16 years and over in South Australia, Australia
Response at 1stinterview (%) Response at 2ndinterview (%) Observed Agreement (%) Expected Agreement (%) Reliability value
Age ICC 1.00
16-34 years 10.4 10.4
35-54 years 21.4 21.4
55 years and over 68.2 68.2
Gender 100.0 51.2 Kappa 100.0
Male 42.2 42.2
Female 57.8 57.8
Number of people in household aged 16 + ICC 0.97 (0.97 - 0.98)
Number of people in household aged < 16 ICC 0.99 (0.99 -1.00)
Region of birth 99.4 62.1 Kappa 0.98 (0.95 – 0.99)
Oceania and Antarctica 76.6 77.3
North West Europe 16.9 16.2
Southern and Eastern Europe 2.6 2.6
North East Asia 0.6 0.6
Southern and Central Asia 1.9 1.9
Americas 1.3 1.3
Health service used in last 4 weeks
Mean (sd) 4.7 (4.917) 4.8 (5.937) ICC 0.90 (0.86 - 0.93)
Range 0-30 0-52
Number of times provided 95.5 99.4
Not stated 4.5 0.6
HEALTH STATUS
Overall health status 85.8 64.3 Weighted Kappaa 0.60 (0.46 - 0.75)
Excellent 13.0 13.0
Very good 36.4 39.6
Good 31.8 34.4
Fair 16.2 9.7
Poor 2.6 3.2
Health conditions (ever been diagnosed by a doctor)
Asthma (ever) 14.3 13.0 93.5 76.4 Kappa 0.72 (0.56 - 0.87)
Diabetes 8.4 8.4 100.0 84.5 Kappa 1.00
Arthritis 26.0 27.3 92.2 60.9 Kappa 0.80 (0.693 - 0.91)
Heart attack 6.5 6.5 97.4 87.9 Kappa 0.79 (0.583 - 0.99)
Angina 3.2 4.5 98.7 92.5 Kappa 0.83 (0.592 - 0.99)
Heart disease 3.9 3.2 96.8 93.1 Kappa 0.52 (0.17 - 0.89)
Stroke 2.6 1.9 99.4 95.6 Kappa 0.85 (0.57 - 0.99)
Osteoporosis 7.1 5.8 99.4 87.9 Kappa 0.79 (0.58 - 0.99)
HEALTH-RELATED RISK FACTORS
Ever been told by doctor or nurse you have …
High blood pressure 35.1 37.0 91.6 53.9 Kappa 0.82 (0.72 - 0.91)
High cholesterol 38.3 37.7 90.3 52.9 Kappa 0.79 (0.69 - 0.89)
Height (cms)
Mean (sd) 169.6 (9.735) 169.2 (9.429) ICC 0.97 (0.96 - 0.98)
Range 147.3-193.0 147.3-193.0
Height provided 98.7 98.7
Not stated 1.3 1.9
Weight (kgs)
Mean (sd) 77.3 (17.117) 77.5 (17.150) ICC 1.00 (0.99 - 1.00)
Range 44.5-151 44.5-150
Weight provided 96.8 96.1
Not stated 3.2 3.9
BMI (derived)c
Mean (sd) 26.7 (4.918) 27.1 (4.980) ICC 0.98 (0.98 - 0.99)
Range 17.1-47.8 18.5-47.5
BMI calculated 96.1 95.4
Not stated 3.9 4.6
Body Mass Index (derived) 97.9 70.2 Weighted Kappaa 0.93 (0.75 - 1.00)
Underweight (<18.5) 0.7 -
Normal (> = 18.5 & < 25) 43.5 40.4
Overweight (> = 25 & <30) 32.0 34.2
Obese (> = 30) 23.8 25.3
Which best describes your home smoking situation…. 96.1 86.0 Kappa 0.59 (0.33 - 0.85)
My home is smoke free (includes smoking is allowed outside) 94.2 94.3
People occasionally smoke in the house 3.9 3.8
People frequently smoke in the house 1.9 1.9
Which of the following describes your smoking status.. 84.4 38.2 Kappa 0.75 (0.66 - 0.84)
I smoke daily 8.4 7.8
I smoke occasionally 2.6 3.9
I don't smoke now but I used to 27.3 29.2
I've tried it a few times but never smoked regularly 6.5 6.5
I've never smoked 55.2 52.6
Smoking status (derived) 89.0 42.4 Kappa 0.81 (0.72 - 0.89)
Smoker 55.2 52.6
Ex -smoker 33.8 35.7
Non -smoker 11.0 11.7
Alcohol consumption
Number of days a week drink alcohol … 83.0 37.5 Weighted Kappab 0.75 (0.64 - 0.85)
Don't drink alcohol 20.1 25.3
Less than once per week 26.0 18.8
1 14.9 18.2
2 11.7 9.1
3 5.8 8.4
4 3.2 3.2
5 4.5 6.5
6 0.6 1.3
7 13.0 9.1
Number of standard drinks per day when drinking.... ICC 0.75 (0.63 - 0.83)
Mean (sd) 2.5 (2.562) 2.3 (2.013)
Range 1-20 1-12
Number of drinks provided 100.0 100.0
Not stated - -
Risk to health due to alcohol consumption (short term) (derived) 95.0 85.3 Weighted Kappab 0.66 (0.45 - 0.87
Non- drinker 20.1 25.3
Low risk 54.5 51.3
Risky 23.4 20.8
High risk 1.9 2.6
Serves vegetables per day ICC 0.64 (0.50 - 0.74)
Mean (sd) 3.0 (1.453) 3.0 (1.600)
Range 0.5 - 8.0 0 - 8.0
Serves per day provided 100.0 98.7
Not stated - 1.3
1 or less serves (derived) 14.3 17.1 93.2 86.2 Weighted Kappaa 0.50 (0.32 - 0.69)
2 to 4 serves 69.5 66.4
5 or more serves 16.2 16.4
Serves fruit per day ICC 0.83 (0.77 - 0.88)
Mean (sd) 1.7 (1.034) 1.6 (1.069)
Range 0 - 8.0 0 - 8.0
Serves per day provided 100.0 100.0
Not stated - -
None to 1 serves (derived) 46.1 54.5 96.0 89.0 Weighted Kappaa 0.60 (0.45 - 0.76)
2 or more serves 53.9 45.5
Total time walking in a week (mins) ICC 0.47 (0.27 - 0.61)
Mean (sd) 120.4 (163.3) 99.3 (163.1)
Range 0-1200 0-1260
Minutes/hours per week provided 100.0 97.4
Not stated - 2.6

Note : ICC Intraclass correlation coefficient.

a: weighting system used: 1 (perfect agreement), 0.8 (difference of 1 category) and 0 (difference of 2 to 4 categories).

b: weighting system used: 1 (perfect agreement), 0.9 (difference of 1 category) and 0 (difference of 2 to 8).

c: only calculated for respondents aged 18 years and over (n = 153).

Dal Grande et al.

Dal Grande et al. BMC Medical Research Methodology 2012 12:108   doi:10.1186/1471-2288-12-108

Open Data