Tool Library Tool Information
Validation Information: Scottish Collaborative Group FFQ
Evaluation of an FFQ to assess total energy and nutrient intakes in severely obese pregnant women
FFQ are popular instruments for assessing dietary intakes in epidemiological studies but have not been validated for use in severely obese pregnancy. The aim of the present study was to compare nutrient intakes assessed by an FFQ with those obtained from a food diary among severely obese pregnant women. Comparison of an FFQ containing 170 food items and a food diary for 4 d (three weekdays and one weekend day); absolute agreement was assessed using the paired t test and relative agreement by Pearson/Spearman correlation, cross-classification into tertiles and weighted kappa values. Antenatal metabolic clinic for severely obese women. Thirty-one severely obese (BMI at booking ≥40·0 kg/m2) and thirty-two lean control (BMI = 20·0 - 24·9 kg/m2) pregnant women. The findings showed that nutrient intakes estimated by the FFQ were significantly higher than those from the food diary; average correlation was 0·32 in obese and 0·43 in lean women. A mean of 48·5% of obese and 47·3% of lean women were correctly classified, while 12·9% (obese) and 10·0% (lean) were grossly misclassified. Weighted κ values ranged from −0·04 to 0·79 in obese women and from 0·16 to 0·78 in lean women. Overall, the relative agreement between the FFQ and food diary was lower in the obese group than in the lean group, but was comparable with earlier studies conducted in pregnant women. The validity assessments suggest that the FFQ is a useful tool for ranking severely obese pregnant women according to the levels of their dietary intake.
Total number of nutrients validated: 36
Not all of the nutrients validated in the validation studies are included in the table below, as statistical data was only selected to be displayed for a number of nutrients, this included:
- Saturated Fat
- Mono-unsaturated Fat
- Poly-unsaturated Fat
- Non‐starch polysaccharides(NSP)
- Folic Acid
- Vitamin B12
- Vitamin C
- Fruit & Vegetables
- Urinary Nitrogen
To find information on the other validated nutrients please read the validation study.
- Macronutrients: 10
- Micronutrients: 25
|Comparator||Lifestage||Sex||Nutrient Measured||Mean Difference||Standard Deviation||Correlation Coefficient||Cohen's Kappa Coefficient||Percentage Agreement||Percentage Agreement Categories||Lower Limits of Agreement||Upper Limits of Agreement|
|Estimated Food Diary||Adults||Female Only||Energy (kJ)||0.28 (P)||0.47||45||3|
|Energy (kJ)||0.46 (P)||0.56||50||3|
|Protein (g)||0.19 (P)||0.47||42||3|
|Protein (g)||0.49 (P)||0.74||53||3|
|Fat (g)||0.38 (P)||0.69||61||3|
|Fat (g)||0.30 (P)||0.56||50||3|
|Saturated Fat (g)||0.50 (P)||0.79||64||3|
|Saturated Fat (g)||0.60 (P)||0.74||53||3|
|MUFA (g)||0.39 (P)||0.36||38||3|
|MUFA (g)||0.43 (P)||0.72||55||3|
|PUFA (g)||0.52 (P)||0.63||50||3|
|PUFA (g)||0.19 (P)||0.56||48||3|
|Carbohydrates (g)||0.23 (P)||0.37||52||3|
|Carbohydrates (g)||0.05 (P)||0.32||44||3|
|Total sugars (g)||0.08 (P)||0.28||31||3|
|Total sugars (g)||0.35 (P)||0.52||48||3|
|Fibre (NSP) (g)||0.53 (P)||0.55||50||3|
|Fibre (NSP) (g)||-0.09 (P)||-0.04||26||3|
|Sodium (mg)||0.40 (P)||0.59||41||3|
|Sodium (mg)||0.33 (P)||0.56||48||3|
|Calcium (mg)||0.59 (P)||0.78||56||3|
|Calcium (mg)||0.41 (P)||0.51||45||3|
|Iron (mg)||0.59 (P)||0.63||50||3|
|Iron (mg)||0.10 (P)||0.27||32||3|
|Zinc (mg)||0.66 (P)||0.77||62||3|
|Zinc (mg)||0.66 (P)||0.47||45||3|
|Retinol (µg)||0.25 (P)||0.67||56||3|
|Retinol (µg)||0.25 (P)||0.67||61||3|
|Folic Acid (mcg)||0.39 (P)||0.59||47||3|
|Folic Acid (mcg)||0.39 (P)||0.22||45||3|
|Vitamin B12 (µg)||0.46 (P)||0.16||38||3|
|Vitamin B12 (µg)||0.39 (P)||0.41||35||3|
|Vitamin C (mg)||0.33 (P)||0.57||50||3|
|Vitamin C (mg)||0.33 (P)||0.57||50||3|
Some results have been calculated using statistical techniques based on the published data.
For further information on statistical terms click on Statistical tests used in validation studies
All correlations coefficients in the table are unadjusted unless stated otherwise. For adjusted correlation coefficients and other statistical methods used in the study e.g. paired t-tests, please read the validation articles.
- # Adjusted
- † Energy adjusted.
- ‡ For loge-transformed, energy-adjusted nutrient intakes.
- ^ Adjacent included.
- ᵟ Participants provided identical responses.
- (w) = Weighted.
Mohd-Shukri NA, Bolton JL, Norman JE, Walker BR, Reynolds RM. Evaluation of an FFQ to assess total energy and nutrient intakes in severely obese pregnant women. Public health nutrition. 2013 Aug 1;16(08):1427-35.