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Table 4 Known Group Validity at baseline

From: Interpreting scores on multiple sclerosis-specific patient reported outcome measures (the PRIMUS and U-FIS)

   PRIMUS QoL   PRIMUS Activities   UFIS
  n Mean (SD) n Mean (SD) n Mean (SD)
EDSS Group       
0-1.5 391 2.7 (3.5) 393 1.6 (3.5) 381 11.7 (11.0)
2-2.5 255 3.8 (4.0) 253 2.7 (3.8) 252 17.6 (13.7)
3-3.5 130 5.3 (4.6) 129 4.5 (5.4) 129 22.2 (14.4)
4-5.5 102 7.4 (5.2) 99 7.7 (5.5) 102 27.1 (14.8)
P   < 0.01   < 0.01   < 0.01
Number of relapses in previous 2 years       
1 259 3.8 (4.3) 260 2.2 (3.4) 262 16.1 (13.8)
2 522 3.8 (4.1) 519 3.1 (4.7) 508 16.2 (13.4)
3+ 101 5.1 (5.3) 101 4.7 (6.3) 100 22.1 (15.4)
P   0.084   < 0.01   < 0.01
Median MS duration group       
Below median (3.2) 439 3.6 (4.2) 435 2.3 (4.1) 435 14.5 (13.3)
Above median (3.2) 439 4.3 (4.4) 439 3.8 (5.0) 429 19.1 (14.1)
P   < 0.01   < 0.01   < 0.01
  1. Non-parametric tests were conducted (Mann-Whitney U Test for two groups and Kruskal-Wallis one-way analysis of variance for three or more groups)