Table 3 |
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|
Comparisons between quantitative MWS and corresponding NSHD variables |
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|
Difference |
Scaled 95% limits |
Intraclass |
Pearson |
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|
MWS |
NSHD |
(MWS - NSHD) |
of agreement |
correlation |
correlation |
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|
|
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|
Variable (units) |
N |
mean (SD) |
mean (SD) |
mean (SD) |
P* |
lower to upper† |
ICC (SE) ‡ |
r (SE) |
|
|
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|
Self-reported at recruitment in the MWS |
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|
Height (cm) |
449 |
162.8 (6.3) |
162.0 (5.7) |
0.9 (2.7) |
<0.001 |
-0.8 to 1.1 |
0.89 (0.01) |
0.91 (0.01) |
|
Weight (kg) |
443 |
68.8 (13.1) |
71.0 (14.1) |
-2.2 (4.2) |
<0.001 |
-0.7 to 0.4 |
0.94 (0.006) |
0.95 (0.004) |
|
Body mass index (kg/m2) |
437 |
25.9 (4.7) |
27.0 (5.2) |
-1.1 (2.0) |
<0.001 |
-1.0 to 0.5 |
0.90 (0.01) |
0.92 (0.01) |
|
Age at menarche (yr) |
394 |
13.0 (1.4) |
12.9 (1.0) |
0.1 (1.2) |
0.093 |
-2.1 to 2.3 |
0.54 (0.04) |
0.57 (0.03) |
|
Age at menopause (yr) |
134 |
48.0 (4.5) |
48.2 (4.2) |
-0.3 (1.8) |
0.091 |
-0.9 to 0.8 |
0.92 (0.01) |
0.92 (0.01) |
|
Self-reported at resurvey in the MWS |
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|
Birth weight (kg) |
234 |
3.2 (0.7) |
3.3 (0.5) |
-0.1 (0.4) |
<0.001 |
-1.8 to 1.4 |
0.75 (0.03) |
0.78 (0.03) |
|
Mother's height (cm) |
294 |
160.4 (7.1) |
161.4 (6.5) |
-0.9 (5.2) |
0.002 |
-1.7 to 1.4 |
0.70 (0.03) |
0.71 (0.03) |
|
Father's height (cm) |
240 |
174.1 (7.6) |
173.7 (7.9) |
0.3 (6.3) |
0.451 |
-1.5 to 1.6 |
0.67 (0.04) |
0.67 (0.04) |
|
Waist circumference (cm) |
206 |
76.0 (9.3) |
82.0 (10.6) |
-6.0 (7.2) |
<0.001 |
-1.9 to 0.8 |
0.59 (0.05) |
0.74 (0.03) |
|
Hip circumference (cm) |
204 |
100.0 (8.3) |
103.1 (8.5) |
-3.2 (5.3) |
<0.001 |
-1.6 to 0.9 |
0.74 (0.03) |
0.80 (0.03) |
|
Waist-to-hip ratio |
197 |
0.76 (0.06) |
0.79 (0.06) |
-0.03 (0.06) |
<0.001 |
-2.4 to 1.3 |
0.41 (0.06) |
0.52 (0.05) |
|
Waist-to-height ratio |
204 |
0.47 (0.06) |
0.51 (0.07) |
-0.04 (0.04) |
<0.001 |
-1.9 to 0.7 |
0.60 (0.05) |
0.75 (0.03) |
|
|
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|
MWS: Million Women Study. NSHD: National Survey of Health and Development. N: numbers of women with non-missing values for both MWS and NSHD variables. r: Pearson correlation. SE: standard error. * P-value for t-test of mean difference = 0. † Lower to upper Bland-Altman limits of agreement divided by the SD of the NSHD data. ‡ ICC(1,1) in the notation of Shrout and Fleiss [26]. |
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|
Cairns et al. BMC Medical Research Methodology 2011 11:7 doi:10.1186/1471-2288-11-7 |
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