Weight-for-age-standards
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 among boys of that height that is greater than or equal to n percent, and less than or equal to (100-n) percent, of weight of boys of that age.
Weight Percentiles for Height for Boys 2-5 Years
13、
B is a boy aged 4 years 3 months[l1] whose height is 110 cm [l2] and whose weight is 19 kg[l3] . For each of the following statements, select Yes if, based on the given information, it must be true of B relative to a model population. Otherwise, select No.
13A No Approximately 50% of boys at the same weight are shorter than B[l4]
13B Yes No more than 15% [l5] of boys at this age are taller than B
13C Yes B's height is greater than or equal to that of 50% [l6] of boys aged 5 years 0 months.
[l1]对应表1：4:3
[l2]表1：109.5-113.1之间
[l3]对应表1纵坐标“19”
[l4]表2中( 13A )
[l5]表1：85th和4:3
[l6]表1：中5:00和110.0cm
14、
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.
14A Yes 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%[l1] .
14B Yes If he is at least 105 cm tall, the probability that his weight is 14.0 kg is no greater than 3%[l2] .
14C No If he is 114cm tall, he is taller than at least 85%[l3] of boys his age.
[l1]如表1：(红色箭头)所示
[l2]表2：14B所示
[l3]表1：14C所示,并不知道年龄,所以无法得出比例
15、
Consider an individual boy from a model population. Suppose that from age 2 through age 5, this boy's weight is at the 50th percentile for his height and his height is at the 50th percentile for his age. Which of the following statements must be true of the boy at age 5 years 0 months?
A. His age is at the 50th percentile for his height[l1]
B. His weight is at the 50th percentile for his age[l2]
C. His height is at the 50th percentile for his weight[l3]
D. His weight is approximately 150% of his weight at age 2 years 0 months.[l4]
E. His weight is approximately 200% of his weight at age 2 years 0 months.[l5]
[l1]没有“年龄-高度”的坐标
[l2]没有“年龄-体重”的坐标
[l3]没有“体重-高度”的坐标
[l4]表1和表2 “15题”
“蓝色虚线图标”
[l5]表1和表2 “15题”
“蓝色虚线图标”
16、
B is a boy aged 4 years 3 months whose height is 110cm and whose weight is 19kg. for each of the following statements, selected Yes if, based on the given information, it must be true of B relative to a model population. Otherwise, select No.
16A Yes At least 15%[l1] of boys at the same height have a weight that is less than or equal to that of B
16B Yes At least 80%[l2] of boys at this age have heights within 10% of B's height
16C No B's height is less than that of at most 3% of boys at age 4 years 0 months[l3] .
[l1]根据表2：110cm &19kg，应该是85th和97th
[l2]B的身高是110cm,相差在10%以内是应该是11cm,所以应该在99到121之间;
根据表1
15th-100.5; 97th-113.1cm
“within”=97-15=82
[l3]根据表1
“107.7cm-85th”
“111.2cm-97th”
B的身高是110cm
百分之九十七的人是111.2(大于110)，所以只有百分之三的小于111.2
而B是110，应该是小于百分之三。
17、
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.
17A No If his age is exactly 4 years 0 months, the probability that his height is at exactly 99.0 cm is 15%[l1]
17B Yes If he is 81cm tall, he is shorter than at least 95%[l2] of boys his age
17C No If he is 120cm tall, he weighs more than 97%[l3] of boys age 2 years 6 months.
[l1]根据表1：15th percentile是99cm，那么15%的小孩的身高会小于等于99cm，而小于99cm的3%，所以应该是15%-3%=12%
[l2]根据表1：在2岁有3rd 的percentile是81.4cm
81cm小于81.4cm
所以是小于97%
[l3]2.6岁身高在85.5-98.3cm
体重在10-16kg之间
120cm，体重在19-26kg之间
18、
Consider an individual boy from a model population. Suppose that from age 2 though age 5, this boy's weight is at the 97th percentile for his height and his weight is at the 97th percentile for his age. Which one of following statements must be true of the boy at age 5 years 0 month?
A. His age is at the 97th[l1] percentile for his height
B. His weight is at the 97th percentile[l2] for his age
C. His height is at the 97th percentile for his weight[l3]
D. His weight is approximately 116% of his weight at age 2 years 0 months[l4]
E. His weight is approximately 197% of his weight at age 2 years 0 months.
[l1]没有age的百分率
[l2]题干：
this boy's weight is at the 97th percentile for his height
不能算出和age的关系
[l3]算不出身高和体重的关系
[l4]
5岁：
根据表1：97percentile是118.7cm
根据表2：118.7cm-25kg
2岁：
根据表1：97percentile是92.9cm
根据表2：92.9cm-16kg
