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Table 5 Mean Hb, FER, sTfR, RBP and folate concentrations at baseline and at 5 months (follow-up) by group and the intervention effects in female Cambodian garment workersa

From: Impact of lunch provision on anthropometry, hemoglobin, and micronutrient status of female Cambodian garment workers: exploratory randomized controlled trial

 

Group

Intervention effect

Intervention

Control

Mean difference

Cohen’s d

p

Hb, g/dL

 Baseline

12.6 ± 0.9 (85)b

12.4 ± 1.0 (85)

 At 5 months, unadjusted

12.6 ± 0.9 (85)

12.3 ± 1.0 (86)

 At 5 months, adjustedc

12.5 (12.4, 12.6) (85)d

12.4 (12.3, 12.5) (85)

0.1 (− 0.1, 0.3)

0.17

0.30

FER, μg/Le

 Baseline

40.4 ± 33.8 (84)

44.9 ± 40.0 (84)

 At 5 months, unadjusted

38.0 ± 27.1 (85)

47.4 ± 39.6 (86)

 At 5 months, adjustedc

39.3 (35.5, 43.0) (84)

45.8 (42.1, 49.6) (84)

−6.6 (−11.9, − 1.3)

− 0.39

0.015

sTfR, mg/L

 Baseline

5.8 ± 2.6 (84)

6.3 ± 3.3 (84)

 At 5 months, unadjusted

5.9 ± 2.6 (85)

6.2 ± 3.5 (86)

 At 5 months, adjustedc

6.1 (5.9, 6.3) (84)

5.9 (5.7, 6.1) (84)

0.2 (−0.1, 0.5)

0.23

0.15

RBP, μmol/Le

 Baseline

1.37 ± 0.26 (84)

1.49 ± 0.31 (84)

 At 5 months, unadjusted

1.42 ± 0.33 (85)

1.44 ± 0.35 (86)

 At 5 months, adjustedc

1.45 (1.39, 1.52) (84)

1.40 (1.34, 1.47) (84)

0.05 (−0.04, 0.14)

0.17

0.27

Folate, ng/mL

 Baseline

8.0 ± 3.1 (78)

7.8 ± 2.9 (74)

 At 5 months, unadjusted

9.6 ± 4.5 (84)

8.2 ± 3.2 (84)

 At 5 months, adjustedc

9.5 (8.8, 10.3) (78)

8.4 (7.6, 9.2) (73)

1.1 (−0.02, 2.2)

0.32

0.054

  1. Hb Hemoglobin, FER Ferritin, sTfR Soluble transferrin receptor, RBP Retinol binding protein
  2. aA general linear model with adjustments for baseline values was used to predict marginal means (95% CIs) for each outcome variable and to estimate intervention effects as corresponding marginal mean differences (95% CIs) including an estimated standardized effect size (Cohen’s d)
  3. bMean ± SD, n in parentheses (all such values)
  4. cAmong subjects with data for both time points
  5. dMarginal mean, 95% CI and n in parentheses (all such values)
  6. eValues adjusted for subclinical inflammation