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Table 3 Parameters and model fit indices for Latent Growth Curve Models and ferritin at 6 months of age (N = 1112)

From: Child linear growth trajectories during the first three years of life in relation to infant iron status: a prospective cohort study in rural Vietnam

 

Conditional LGC Including ferritin

Conditional LGC Adjusted including ferritin

Estimate

95% CI

P-value

Estimate

95% CI

P-value

Growth parameters

 6 months

  Intercept 6 months

–0·220

(–0·457, –0·018)

0·0700

–0·060

(–0·325, 0·206)

0·6588

  Ferritin 6 monthsa

–0·066

(–0·114, –0·018)

0·0067

–0·147

(–0·191, –0·103)

<0·0001

  Female sex

-

-

-

0·321

( 0·217, 0·424)

<0·0001

  Birth weight (kg)b

-

-

-

1·079

( 0·947, 1·210)

<0·0001

  Child anaemia at 6 months

-

-

 

0·039

(–0·067, 0·145)

0·4726

  Maternal education (secondary school)c

-

-

-

0·118

(–0·024, 0·260)

0·1032

  Maternal education (university college)c

-

-

-

0·245

( 0·070, 0·420)

0·0060

  Maternal supplementation (twice IFA)§

-

-

-

–0·166

(–0·288, –0·044)

0·0075

  Maternal supplementation (MMN)§

-

-

-

–0·023

(–0·147, 0·101)

0·7186

  6–18 months

  Linear slope 6–18 months

–0·205

(–0·288, –0·122)

<0·0001

–0·226

(–0·329, –0·122)

<0·0001

  Ferritin 6 monthsa

–0·005

(–0·021, 0·012)

0·5793

–0·002

(–0·019, 0·015)

0·8037

  Female sex

-

-

-

–0·025

(–0·064, 0·015)

0·2280

  Birth weight (kg)b

-

-

-

–0·073

(–0·124, –0·021)

0·0058

  Child anaemia at 6 months

-

-

-

–0·029

(–0·069, 0·012)

0·1654

  Maternal education (secondary school)c

-

-

-

0·025

(–0·030, 0·080)

0·3684

  Maternal education (university college)c

-

-

-

0·134

( 0·066, 0·203)

0·0001

  Maternal supplementation (twice IFA)§

-

-

-

0·009

(–0·038, 0·056)

0·7054

  Maternal supplementation (MMN)§

-

-

-

–0·028

(–0·076, 0·019)

0·2465

  18–36 months

  Linear slope 18–36 months

–0·038

(–0·080, –0·005)

0·0814

–0·011

(–0·063, 0·041)

0·6732

  Ferritin 6 monthsa

–0·004

(–0·012, 0·005)

0·3853

0·005

(–0·003, 0·014)

0·2234

  Female sex

-

-

-

–0·071

(–0·091, –0·051)

<0·0001

  Birth weight (kg)b

-

-

-

–0·076

(–0·101, –0·050)

<0·0001

  Child anaemia at 6 months

-

-

-

–0·008

(–0·029, 0·012)

0·4314

  Maternal education (secondary school)c

-

-

-

–0·024

(–0·051, 0·004)

0·0873

  Maternal education (university college)c

-

-

-

–0·029

(–0·063, 0·004)

0·0892

  Maternal supplementation (twice IFA)d

-

-

-

–0·016

(–0·039, 0·007)

0·1798

  Maternal supplementation (MMN)d

-

-

-

–0·017

(–0·040, 0·007)

0·1702

Variance-Covariancee

 Variance Intercept 6 months

0·752

( 0·678, 0·834)

<0·0001

0·569

( 0·509, 0·635)

-

 Variance Slope 6–18 months

0·042

( 0·033, 0·055)

<0·0001

0·041

( 0·031, 0·053)

-

 Variance Slope 18–36 months

0·016

( 0·013, 0·019)

<0·0001

0·014

( 0·012, 0·017)

-

 Correlation Intercept-Slope 6–18 months

–0·024

(–0·146, 0·097)

0·6989

0·000

(–0·020 0·020)

0·969

 Correlation Intercept-Slope 18–36 months

–0·431

(–0·518, –0·344)

<0·0001

–0·032

(–0·041, –0·024)

<0·0001

 Correlation Slope 6–18 and 18–36 months

0·015

(–0·127, 0·157)

0·8370

–0·000

(–0·004 0·003)

0·849

 Variance Ferritin 6 months

1·654

( 1·509, 1·812)

<0·0001

1·655

( 1·511, 1·813)

-

Fit indices

 CFI

0·991

0·992

 TLI

0·988

0·986

 RMSEA (Prob[RMSEA≤0·05])

0·064 (0·0421)

0·041 (0·9468)

  1. CI Confidence Interval, IFA Iron-Folic Acid, MMN Multiple MicroNutrients, CFI Comparative Fit Index, TLI TuckerLewis Index, RMSEA Root-Mean Standardised Error of Approximation, LGC Latent Growth Curve
  2. aFerritin is (log2 -transformed) ferritin
  3. bBirth weight is (mean-centered) birth weight (kg)
  4. cMaternal education compared to primary school
  5. dMaternal supplementation compared to daily iron-folic-acid
  6. eOnly the random effects related to the latent growth parameters and ferritin are presented
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ISSN: 2055-0928

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