Table 5.
Reproducibility of the analysed semiquantitative FFQ (SFFQ), ordered chronologically
| Reference | Separation between SFFQ | Correlations coefficients (minimum and maximum values)* | Intraclass correlation coefficients (minimum and maximum values) | Classification of reproducibility | ||
|---|---|---|---|---|---|---|
| Unadjusted | Energy adjusted | Unadjusted | Energy adjusted | |||
| Willet et al. (42) | 1 year | r = 0·52–0·71 | ND | r = 0·49–0·71 | ND | ND |
| Rimm et al. (39) | 1 year | ND | ND | r = 0·47–0·80 | r = 0·35–0·79 | R |
| Longnecker et al. (51) | 6–12 months | r = 0·39–0·81 | r = 0·43–0·80 | ND | ND | ND |
| Martín et al. (5) | 1 year | r = 0·51–0·88 | ND | ND | ND | GR |
| Gnardellis et al. (12) | 1 year | ND | ND | r = M: 0·38–0·77; W: 0·39–0·78 | r = M: 0·31–0·75; W: 0·30–0·79 | R |
| Friis et al. (35) | 1 year | r = 0·24–0·63; D: 0·30–0·88 | r = 0·24–0·69 | ND | ND | R |
| Ocké et al. (20) | 6 months | r = M: 0·78–0·94; W: 0·61–0·93 | r = M: 0·71–0·94; W: 0·46–0·93 | ND | ND | ND |
| 1 year |
r = M: 0·70–0·89; W: 0·59–0·94 |
r = M: 0·64–0·89; W: 0·60–0·94 |
||||
| Hérnandez et al. (47) | 1 year | ND | ND | r = 0·43–0·60 | r = 0·25–0·54 | R |
| Klipstein et al. (14) | 2 years | ND | ND | r = 0·49–0·88 | ND | ND |
| Smith et al. (67) | 1 month | r = 0·66–0·95; σ = 0·67–0·96 | ND | ND | ND | RA |
| 12–18 months | r = 0·32–0·83; σ = 0·29–0·88 | ND | ND | ND | ||
| Jackson et al. (48) | 4–8 weeks (n 33) | r = 0·49–0·94 | r = 0·49–0·93 | ND | ND | RR |
| 1 year (n 90 and n 123) | r = 0·29–0·68 (n 90); 0·42–0·71 (n 123) | r = 0·34–0·68 (n 90); 0·42–0·60 (n 123) | r = 0·42–0·69 (n 123) | ND | GR | |
| Schröder et al. (26) | Short-term | r = 0·60–0·95 | ND | r = 0·52–0·94 | ND | ND |
| Roddam et al. (23) | 1–2 years | ND | r = 0·25–0·87 (1 year); 0·21–0·81 (2 years)†‡ | ND | ND | ER |
| Dumartheray et al. (31) | 1 month | r = 0·37–0·84; 0·44–0·90§ | r = 0·23–0·93; 0·57–0·89 § | ND | ND | ND |
| 1 year | r = 0·16–0·66; 0·07–0·95 § | r = -0·02–0·83; 0·01–0·93 § | ND | ND | ||
| Sudha et al. (59) | 1 year | r = 0·41–0·78 | ND | ND | ND | RR |
| Mullie et al. (18) | 2 weeks | ND | r = 0·42–0·79 | ND | ND | RR |
| Barret and Gibson(64) | 1 year | ND | ND | r = 0·35–0·93 | ND | R |
| Fernández et al. (32) | 1 year | r = 0·50–0·78 | r = 0·52–0·77; 0·47–0·82¶ | r = 0·67–0·88 | r = 0·68–0·87; 0·63–0·90‖ | GR |
| Dehghan et al. (37) | 1 year | r = U: 0·30–0·56; D: 0·32–0·60 | ND | r = U: 0·10–0·54; R: 0·33–0·60 | ND | RR |
| Park et al. (58) | 1 year | σ = 0·50–0·64; 0·41–0·82‖ | ND | ND | ND | RA |
| Macedo et al. (52) | 1 year | r = 0·18–0·73; 0·27–0·77‖ | r = 0·20–0·69 | r = 0·30–0·85; 0·42–0·87‖ | r = 0·34–0·82 | R |
| Sanjeevi et al. (44) | 1 month | ND | ND | 0·39–0·76 | ND | RA |
| Whitton et al. (62) | 6 months | ND | ND | 0·62–0·85§ | ND | GR |
| Yuan et al. (43) | 1 year | ND | ND | r = 0·50–0·91 | r = 0·46–0·86; 0·56–0·91¶ | ND |
| Aoun et al. (63) | 4 months | ND | ND | 0·822–0·998 | ND | ER |
SFFQs, Semiquantitative food-frequency questionnaires; r, Pearson correlation coefficient; ND, Not described; R, Reproducible; GR, Good reproducibility; M, Men; W, Women; RA, Reasonably acceptable; σ, Spearman’s rank correlation coefficient; RR, Relatively reproducible; ER, Excellent reproducibility; U, Urban; R, Rural.
*Pearson’s correlation coefficient, unless otherwise noted.
†Performed on a larger sample of people; not the same n that were validated.
‡Kappa.
§Log-transformation.
‖For food groups.
¶Energy density method (divides the nutrient portion by total energy intake).