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The World Health Organization (WHO)

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The World Health Organization (WHO) [#permalink]

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The World Health Organization (WHO) has produced a comprehensive set of growth standards for children. These standards are based on studies of children living in 6 nations on 5 continents under optimal conditions with respect to health and nutrition. The table displays the percentil distribution of height, in centimeters, at 3-month intervals, for boys ages 2 through 5 according to the WHO model. In a model population -- a large population of boys ages 2 through 5 that conforms to the WHO growth standards -- for n = 3, 15, 50, 85, and 97, nth percentile in height for a given age is the unique height among boys of that age that is greater than or equal to n percent, and less than or equal to (100- n) percent, of heights of boys of that age.

refer fig 1
Attachment:
File comment: Fig 1
fig1.JPG
fig1.JPG [ 47.24 KiB | Viewed 4348 times ]


The graph shows the percentile distribution of weight, in kilograms, for heights from 80 cm to 120 cm, for boys ages 2 through 5, according to the WHO model. In a model population, for n = 3, 15, 50, 85, and 97, the nth percentile in weight for a given heigh is the unique weight among boys of that height that is greater than or equal to n percent, and less than or equal to (100 - n) percent, of weights of boys of that height.

refer fig 2
Attachment:
File comment: Fig 2
fig2.JPG
fig2.JPG [ 29.31 KiB | Viewed 4346 times ]

For each of the following statements, select Yes if the statement must be true of a boy selected at random from a model population. Otherwise, select No.


A. If his age is greater than 3 years 3 months, the probability that his height is at least 98.0 cm is greater than 50%.


B. If he is at least 105 cm tall, the probability that his weight is 14.0 kg is no greater than 3%


C. If he is 114 cm tall, he is taller than at least 85% of boys his age.

[Reveal] Spoiler: OA
A yes
B Yes
C No

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Last edited by maybeam on 15 Jul 2012, 10:05, edited 1 time in total.

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New post 15 Jul 2012, 09:44

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Re: The World Health Organization (WHO) [#permalink]

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New post 15 Jul 2012, 10:06
carcass wrote:
For me is difficult to make an answer due to the layout on a forum, or website :(

made some changes

the first table is height vs age

and the second table gives the relationship b/w
height vs weight.

Hope this will be helpful
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New post 16 Jul 2012, 03:33

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Re: The World Health Organization (WHO) [#permalink]

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New post 16 Jul 2012, 06:19
carcass wrote:
1) yes ---> 3.3 --> 50th--> 98.0.

2) yes ---> at least 3rd ---> line black

3) no ----> at least 85% line green -----> no



the definition is as nth percentile in height for a given age is the unique height among boys of that age that is greater than or equal to n percent, and less than or equal to (100- n) percent

so for Q.A : how can you be sure that the probability is greater than 50%
it can be 50% as well, right?
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Re: The World Health Organization (WHO) [#permalink]

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New post 16 Aug 2012, 09:43
can someone please explain the tabs? I cant understand the tabs.

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New post 02 Aug 2013, 13:45
carcass wrote:
1) yes ---> 3.3 --> 50th--> 98.0.

2) yes ---> at least 3rd ---> line black

3) no ----> at least 85% line green -----> no


why are you looking at the Height-Weight relation (Green line) for #3.) ? The question just states the height which can be traced from graph 1. No ?

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The World Health Organization (WHO) [#permalink]

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Attachment:
Table 3.1 Age vs Height..jpg
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For question 1 isn't this scenario possible
:Let age be 3.6 and 98cms correspond to 49 percentile.
because in the first graph Age 3.6 and height 99.9 corresponds to 50th percentile so isn't it also possible that 98cms may be in the 49th percentile.
Please see the attached table illustrating this scenario.
Can some expert please point out why in table 3.1 the scenario highlighted in Green in not possible?

In the table above I have just added two more percentiles 45th and 49th in between 15th and 50th, and two single month increments between ages 3.3 and 3.6. This extra data has been highlighted in Grey.
The table is consistent with the rest of the data given in the original table.
There is an increment in height as we go from left to right and also there is an increment in height as we go from top to bottom.

Question 1 states:
A. If his age is greater than 3 years 3 months; the probability that his height is at least 98.0 cm is greater than 50%.

if we look at the table then the scenario in green is a possibility is it not? The scenario in green states that, at age 3.6 if height is 98.0 then it is in the 49th percentile.

So height 98cms at age greater than 3.3 need not be greater than 50th percentile.

So if the scenario in the table above is possible then answer to question 1 need NOT be yes.
Can experts please tell why the scenario in Green in not possible?

Thank you.
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Re: The World Health Organization (WHO) [#permalink]

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New post 21 Nov 2017, 09:46
maybeam wrote:
carcass wrote:
1) yes ---> 3.3 --> 50th--> 98.0.

2) yes ---> at least 3rd ---> line black

3) no ----> at least 85% line green -----> no



the definition is as nth percentile in height for a given age is the unique height among boys of that age that is greater than or equal to n percent, and less than or equal to (100- n) percent

so for Q.A : how can you be sure that the probability is greater than 50%
it can be 50% as well, right?


Hi,

It can't be 50%, has to be greater than 50% as, count is from {50,51....100} = 51

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Re: The World Health Organization (WHO)   [#permalink] 21 Nov 2017, 09:46
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