1. (1) DDA determines your SIS support needs index percentile ranking by adding together the standard scores (WAC 388-828-4420) for the following supports intensity scale assessment subscales:

   1. (a) Home living activities in WAC 388-828-4200.
   2. (b) Community living activities in WAC 388-828-4220.
   3. (c) Health and safety activities in WAC 388-828-4280.
   4. (d) Lifelong learning activities in WAC 388-828-4240.
   5. (e) Work activities in WAC 388-828-4260.
   6. (e) Social activities in WAC 388-828-4300.
2. (2) Your standard scores for the above scales are added together to determine the sum of the standard scores.
3. (3) The advocacy activities scale, and the exceptional medical and behavioral supports scales are not used in determining your support needs index percentile ranking.

4. (4) The sum of the standard scores is converted to your support needs index percentile ranking using the following table:

   If the sum of the standard scores is:	Your support needs index percentile is:
   ≥91	˃99
   90	99
   89	99
   88	99
   87	98
   86	98
   85	97
   84	97
   83	96
   82	95
   81	95
   80	94
   79	93
   78	92
   77	91
   76	89
   75	87
   74	86
   73	84
   72	82
   71	81
   70	77
   69	75
   68	73
   67	70
   66	68
   65	65
   64	63
   63	58
   62	55
   61	53
   60	50
   59	47
   58	45
   57	39
   56	37
   55	35
   54	32
   53	30
   52	27
   51	25
   50	23
   49	19
   48	18
   47	16
   46	14
   45	13
   44	13
   43	9
   42	8
   41	7
   40	6
   39	5
   38	5
   37	4
   36	3
   35	3
   34	2
   33	2
   32	1
   31	1
   30	1
   ≤29	<1

[Statutory Authority: RCW 71A.12.030 and 71A.16.050. WSR 24-23-058, s 388-828-4440, filed 11/15/24, effective 1/1/25. Statutory Authority: RCW 71A.12.030 and 2012 c 49. WSR 13-01-080, § 388-828-4440, filed 12/18/12, effective 1/18/13.]