Table 2.
Mean HEI-2010a by energy-adjusted diet cost quintile among adults (age≥20), overall and by genderb in NHANES 2007-2010
| Overall (n=11,181) |
Men (n=5,450) |
Women (n=5,731) |
|
|---|---|---|---|
| Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | |
| Cost per 2,000 kcalc | |||
| Q1 (n=2,545) [ref] | 44.2 (42.7, 45.7) | 44.2 (42.4, 46.0) | 44.0 (42.1, 45.9) |
| Q2 (n=2,348) | 50.1 (48.7, 51.5)*** | 48.2 (46.3, 50.2)** | 52.7 (50.9, 54.6)*** |
| Q3 (n=2,231) | 55.8 (54.1, 57.6)*** | 54.0 (51.6, 56.4)*** | 58.2 (56.4, 59.8)*** |
| Q4 (n=2,073) | 60.2 (58.2, 62.1)*** | 57.0 (54.8, 59.1)*** | 63.6 (60.6, 66.5)*** |
| Q5 (n=1,984) | 66.6 (65.3, 67.9)*** | 64.0 (61.5, 66.5)*** | 68.3 (66.7, 69.9)*** |
| p-trend | <0.001 | <0.001 | <0.001 |
CI is confidence interval
a
HEI-2010 estimated using the population ratio method
b
The association between diet cost and HEI-2010 scores varied by gender, p-interaction=0.003
c
Q1<$3.98 (2007-2008) & <$4.21 (2009-2010); Q2 $3.98-4.75 (2007-2008) & $4.21-5.03 (2009-2010); Q3 $4.76-5.59 (2007-2008) & $5.04-6.02 (2009-2010); Q4 $5.60-6.91 (2007-2008) & $6.03-7.58 (2009-2010); Q5 ≥$6.92 (2007-2008) & ≥$7.58 (2009-2010)
Significance of pairwise comparisons are indicated by asterisk as follows:
* 0.05 > p-value > 0.01;
**
0.01 > p-value > 0.001;
***
p-value < 0.001.
The reference was the lowest diet cost quintile.