This phenotype returns the weight-for-age percentile and z-score per case based on the patient's age in years, sex, and weight (kg) at time of surgery.
Step I: Obtain weight (kg), sex and age values from their respective collation.
Collations have specific valid ranges which are defined in their respective collation documentation. See these collation documents for more information.
Step II: Calculate the corresponding z-score based on LMS parameters listed in the CDC/WHO reference tables (weight-for-age charts, birth to 24 month, based on sex).
|
Sex
|
Years
|
Months
|
Weeks
|
L
|
M
|
S
|
|
F
|
0
|
0
|
0
|
0.3809
|
3.2322
|
0.14171
|
|
F
|
0.01923
|
0.2
|
1
|
0.2671
|
3.3388
|
0.146
|
|
F
|
0.038461
|
0.5
|
2
|
0.2304
|
3.5693
|
0.14339
|
|
F
|
0.057692
|
0.7
|
3
|
0.2024
|
3.8352
|
0.1406
|
|
F
|
0.076923
|
0.9
|
4
|
0.1789
|
4.0987
|
0.13805
|
|
F
|
0.083333
|
1
|
5-8
|
0.1714
|
4.1873
|
0.13724
|
|
F
|
0.166666
|
2
|
9-12
|
0.0962
|
5.1282
|
0.13
|
|
F
|
0.25
|
3
|
13
|
0.0402
|
5.8458
|
0.12619
|
|
F
|
0.333333
|
4
|
17.3
|
-0.005
|
6.4237
|
0.12402
|
|
F
|
0.416666
|
5
|
21.7
|
-0.043
|
6.8985
|
0.12274
|
|
F
|
0.5
|
6
|
26
|
-0.0756
|
7.297
|
0.12204
|
|
F
|
0.583333
|
7
|
30.3
|
-0.1039
|
7.6422
|
0.12178
|
|
F
|
0.666666
|
8
|
34.7
|
-0.1288
|
7.9487
|
0.12181
|
|
F
|
0.75
|
9
|
39
|
-0.1507
|
8.2254
|
0.12199
|
|
F
|
0.833333
|
10
|
43.3
|
-0.17
|
8.48
|
0.12223
|
|
F
|
0.916666
|
11
|
47.7
|
-0.1872
|
8.7192
|
0.12247
|
|
F
|
1
|
12
|
52
|
-0.2024
|
8.9481
|
0.12268
|
|
F
|
1.083333
|
13
|
56.3
|
-0.2158
|
9.1699
|
0.12283
|
|
F
|
1.166666
|
14
|
60.7
|
-0.2278
|
9.387
|
0.12294
|
|
F
|
1.25
|
15
|
65
|
-0.2384
|
9.6008
|
0.12299
|
|
F
|
1.333333
|
16
|
69.3
|
-0.2478
|
9.8124
|
0.12303
|
|
F
|
1.416666
|
17
|
73.7
|
-0.2562
|
10.0226
|
0.12306
|
|
F
|
1.5
|
18
|
78
|
-0.2637
|
10.2315
|
0.12309
|
|
F
|
1.583333
|
19
|
82.3
|
-0.2703
|
10.4393
|
0.12315
|
|
F
|
1.666666
|
20
|
86.7
|
-0.2762
|
10.6464
|
0.12323
|
|
F
|
1.75
|
21
|
91
|
-0.2815
|
10.8534
|
0.12335
|
|
F
|
1.833333
|
22
|
95.3
|
-0.2862
|
11.0608
|
0.1235
|
|
F
|
1.916666
|
23
|
99.7
|
-0.2903
|
11.2688
|
0.12369
|
|
F
|
2
|
24
|
104
|
-0.2941
|
11.4775
|
0.1239
|
|
M
|
0
|
0
|
0
|
0.3487
|
3.3464
|
0.14602
|
|
M
|
0.01923
|
0.2
|
1
|
0.2776
|
3.4879
|
0.14483
|
|
M
|
0.038461
|
0.5
|
2
|
0.2581
|
3.7529
|
0.14142
|
|
M
|
0.057692
|
0.7
|
3
|
0.2442
|
4.0603
|
0.13807
|
|
M
|
0.076923
|
0.9
|
4
|
0.2331
|
4.3671
|
0.13497
|
|
M
|
0.083333
|
1
|
5-8
|
0.2297
|
4.4709
|
0.13395
|
|
M
|
0.166666
|
2
|
9-12
|
0.197
|
5.5675
|
0.12385
|
|
M
|
0.25
|
3
|
13
|
0.1738
|
6.3762
|
0.11727
|
|
M
|
0.333333
|
4
|
17.3
|
0.1553
|
7.0023
|
0.11316
|
|
M
|
0.416666
|
5
|
21.7
|
0.1395
|
7.5105
|
0.1108
|
|
M
|
0.5
|
6
|
26
|
0.1257
|
7.934
|
0.10958
|
|
M
|
0.583333
|
7
|
30.3
|
0.1134
|
8.297
|
0.10902
|
|
M
|
0.666666
|
8
|
34.7
|
0.1021
|
8.6151
|
0.10882
|
|
M
|
0.75
|
9
|
39
|
0.0917
|
8.9014
|
0.10881
|
|
M
|
0.833333
|
10
|
43.3
|
0.082
|
9.1649
|
0.10891
|
|
M
|
0.916666
|
11
|
47.7
|
0.073
|
9.4122
|
0.10906
|
|
M
|
1
|
12
|
52
|
0.0644
|
9.6479
|
0.10925
|
|
M
|
1.083333
|
13
|
56.3
|
0.0563
|
9.8749
|
0.10949
|
|
M
|
1.166666
|
14
|
60.7
|
0.0487
|
10.0953
|
0.10976
|
|
M
|
1.25
|
15
|
65
|
0.0413
|
10.3108
|
0.11007
|
|
M
|
1.333333
|
16
|
69.3
|
0.0343
|
10.5228
|
0.11041
|
|
M
|
1.416666
|
17
|
73.7
|
0.0275
|
10.7319
|
0.11079
|
|
M
|
1.5
|
18
|
78
|
0.0211
|
10.9385
|
0.11119
|
|
M
|
1.583333
|
19
|
82.3
|
0.0148
|
11.143
|
0.11164
|
|
M
|
1.666666
|
20
|
86.7
|
0.0087
|
11.3462
|
0.11211
|
|
M
|
1.75
|
21
|
91
|
0.0029
|
11.5486
|
0.11261
|
|
M
|
1.833333
|
22
|
95.3
|
-0.0028
|
11.7504
|
0.11314
|
|
M
|
1.916666
|
23
|
99.7
|
-0.0083
|
11.9514
|
0.11369
|
|
M
|
2
|
24
|
104
|
-0.0137
|
12.1515
|
0.11426
|
- X: weight (kg)
- L: Power in the Box-Cox transformation
- M: Median
- S: Generalized coefficient of variation
Step III: Determine weight percentile based on the returned z-score: CDC/WHO reference tables (weight-for-age charts, birth to 24 months, based on sex).
- Calculate Z.
- Return weight percentile for age based on sex.