Reader Comments

Post a new comment on this article

Unit conversion problem in Table 6

Posted by Emmanuel_Grellety on 13 Apr 2013 at 15:24 GMT

Dear Editor,

I am contacting you today regarding the article published in PLOS One ref 2012; 7(9):e44549: Grellety E, Shepherd S, Roederer T, Manzo ML, Doyon S, et al. Effect of Mass Supplementation with Ready-to-Use Supplementary Food during an Anticipated Nutritional Emergency.

As the first author, I would like to inform you that, a few days ago, we discovered a unit conversion problem in table 6 (see correction below). This problem does not affect the interpretation of results but I would like to publish an erratum in PLOS ONE so that readers may have the properly converted figures.

I look forward to hearing from you soon.
Best regards,
Emmanuel Grellety

In the original text, abstract part:
“The absolute rate of wasting was 4.71 events per child-year (503 events/106.59 child-year) in the intervention group and 4.98 events per child-year (322 events/64.54 child-year) in the comparison group.”
Correction:
“The absolute rate of wasting was 1.59 events per child-year (503 events/315.3 child-year) in the intervention group and 1.78 events per child-year (322 events/180.4 child-year) in the comparison group.”

In the original text, results section:
“The absolute rate of wasting was 4.71 events per child-year (503 events/1,280 child-months) in the intervention group and 4.98 events per child-year (322 events/775 child-months) in the comparison group.”
Correction:
“The absolute rate of wasting was 1.59 events per child-year (503 events/3,784 child-months) in the intervention group and 1.78 events per child-year (322 events/2,165 child-months) in the comparison group.”

In the original text, results section:
“Mortality was lower for children whose households were in the intervention group than those who were not (adjusted HR: 0.55, 95% CI: 0.32 to 0.98) (Table 4).”
Correction:
“Mortality was lower for children whose households were in the intervention group than those who were not (adjusted HR: 0.55, 95% CI: 0.32 to 0.98) (Table 6).”

In the original text, discussion section:
“It is important to note that the population was under very severe stress with mortality rates when expressed in conventional emergency terms of 1.6/10,000/d for the intervention group and 2.7/10,000/d for the comparison group.”
Correction:
“It is important to note that the population was under very severe stress with mortality rates when expressed in conventional emergency terms of 1.7/10,000/d for the intervention group and 2.9/10,000/d for the comparison group.”

In the original table:
Table 6. Effect of supplementation on the incidence of wasting, stunting1 and morality between the first distribution and 2 weeks after the last distribution (97 to 101 days), July-October 2010 Guidam Roumdji and Madarounfa Districts, Niger.

Measure Intervention group Comparison group p-value
Wasting (WHO 2006) 0.05
N 1135 692
Number of events/ child-month at risk 503/1280 322/775
Incidence rate per 100 child-month (95% CI) 3.92 (3.62-4.31) 4.15 (3.74-4.63)
Unadjusted HR (95% CI) 0.96 (0.81-1.14) 1.00 (reference)
Adjusted HR3 (95% CI) 0.84 (0.71-0.99) 1.00 (reference)
Severe wasting (WHO 2006) 0.37
N 1368 811
Number of events/ child-month at risk 97/1598 61/941
Incidence rate per 100 child-month (95% CI) 6.09 (4.91-7.33) 6.48 (5.13-8.33)
Unadjusted HR (95% CI) 0.96 (0.63-1.43) 1.00 (reference)
Adjusted HR3 (95% CI) 0.83 (0.56-1.24) 1.00 (reference)
MUAC less than 125mm 0.56
N 1166 717
Number of events/ child-month at risk 624/1320 411/806
Incidence rate per 100 child-month (95% CI) 47.3 (43.6-51.1) 50.1 (46.2-56.1)
Unadjusted HR (95% CI) 1.15 (1.02-1.31) 1.00 (reference)
Adjusted HR3 (95% CI) 1.04 (0.91-1.17) 1.00 (reference)
MUAC less than 115mm 0.44
N 1351 816
Number of events/ child-month at risk 105/1602 68/945
Incidence rate per 100 child-month (95% CI) 6.55 (5.44-8.00) 7.19 (5.62-9.01)
Unadjusted HR (95% CI) 0.95 (0.64-1.43) 1.00 (reference)
Adjusted HR3 (95% CI) 0.85 (0.57-1.28) 1.00 (reference)
Stunting 0.87
N 474 255
Number of events per child-month 144/536 42/291
Incidence rate per 100 child-month (95% CI) 26.8 (22.8-31.6) 14.4 (10.7-19.5)
Unadjusted HR (95% CI) 1.77 (1.13-2.77) 1.00 (reference)
Adjusted HR3 (95% CI) 0.96 (0.61-1.52) 1.00 (reference)
Severe stunting 0.98
N 907 535
Number of events per child-month 145/1067 45/623
Incidence rate per 100 child-month (95% CI) 13.6 (11.5-15.9) 7.21 (5.37-9.73)
Unadjusted HR (95% CI) 1.79 (1.14-2.81) 1.00 (reference)
Adjusted HR3 (95% CI) 1.00 (0.62-1.62) 1.00 (reference)
Mortality 0.03
N 1400 838
Number of events/ child- month at risk 27/1678 24/994
Incidence rate per 100 child-month (95% CI) 1.61 (1.10-2.37) 2.41 (1.55-3.62)
Unadjusted HR (95% CI) 0.70 (0.40-1.21) 1.00 (reference)
Adjusted HR3 (95% CI) 0.55 (0.32-0.98) 1.00 (reference)

Correction:
Table 6. Effect of supplementation on the incidence of wasting, stunting1 and morality between the first distribution and 2 weeks after the last distribution (97 to 101 days), July-October 2010 Guidam Roumdji and Madarounfa Districts, Niger.

Measure Intervention group Comparison group p-value
Wasting (WHO 2006) 0.05
N 1135 692
Number of events/ child-month at risk 503/3784 322/2165
Incidence rate per 100 child-month (95% CI) 13.29 (12.27-14.61) 14.87 (13.40-16.59)
Unadjusted HR (95% CI) 0.96 (0.81-1.14) 1.00 (reference)
Adjusted HR3 (95% CI) 0.84 (0.71-0.99) 1.00 (reference)
Severe wasting (WHO 2006) 0.37
N 1368 811
Number of events/ child-month at risk 97/4567 61/2831
Incidence rate per 100 child-month (95% CI) 2.12 (1.71-2.55) 2.16 (1.72-2.78)
Unadjusted HR (95% CI) 0.96 (0.63-1.43) 1.00 (reference)
Adjusted HR3 (95% CI) 0.83 (0.56-1.24) 1.00 (reference)
MUAC less than 125mm 0.56
N 1166 717
Number of events/ child-month at risk 624/3903 411/2510
Incidence rate per 100 child-month (95% CI) 15.98 (14.73-17.26) 16.37 (15.09-18.33)
Unadjusted HR (95% CI) 0.98 (0.92-1.11) 1.00 (reference)
Adjusted HR3 (95% CI) 0.94 (0.81-1.17) 1.00 (reference)
MUAC less than 115mm 0.44
N 1351 816
Number of events/ child-month at risk 105/4522 68/2857
Incidence rate per 100 child-month (95% CI) 2.32 (1.92-2.83) 2.38 (1.86-2.98)
Unadjusted HR (95% CI) 0.95 (0.64-1.43) 1.00 (reference)
Adjusted HR3 (95% CI) 0.85 (0.57-1.28) 1.00 (reference)
Stunting 0.87
N 474 255
Number of events per child-month 144/1045 42/641
Incidence rate per 100 child-month (95% CI) 13.8 (11.74-16.27) 6.55 (4.86-8.87)
Unadjusted HR (95% CI) 1.77 (1.13-2.77) 1.00 (reference)
Adjusted HR3 (95% CI) 0.96 (0.61-1.52) 1.00 (reference)
Severe stunting 0.98
N 907 535
Number of events per child-month 145/2163 45/1294
Incidence rate per 100 child-month (95% CI) 6.70 (5.66-7.83) 3.47 (2.58-4.68)
Unadjusted HR (95% CI) 1.79 (1.14-2.81) 1.00 (reference)
Adjusted HR3 (95% CI) 1.00 (0.62-1.62) 1.00 (reference)
Mortality 0.03
N 1400 838
Number of events/ child- month at risk 27/4594 24/2711
Incidence rate per 100 child-month (95% CI) 0.58 (0.39-0.86) 0.88 (0.56-1.32)
Unadjusted HR (95% CI) 0.70 (0.40-1.21) 1.00 (reference)
Adjusted HR3 (95% CI) 0.55 (0.32-0.98) 1.00 (reference)

No competing interests declared.