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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