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Table 3 Intraclass correlation coefficients (ICC, two-way, random, single measure) with 95 % confidence interval for speed, stride length, cadence and stride time for each slope and walking

From: Validity and reliability of a portable gait analysis system for measuring spatiotemporal gait characteristics: comparison to an instrumented treadmill

Condition Speed Stride length Cadence Stride time
Validity
0 % slope
 Slow speed .953 (.883–.981) .897 (.746–.958) 1.000 (1.000–1.000) 1.000 (.999–1.000)
 Normal speed .985 (.964–.994) .954 (.886–.981) 1.000 (1.000–1.000) 1.000 (1.000–1.000)
 Fast speed .944 (.863–.977) .914 (.789–.965) .975 (.937–.990) 1.000 (.999–1.000)
15 % slope
 Slow speed .937 (.836–.976) .763 (.417–.904) 1.000 (1.000–1.000) 1.000 (1.000–1.000)
 Normal speed .991 (.976–.996) .727 (.327–.889) 1.000 (1.000–1.000) 1.000 (1.000–1.000)
 Fast speed .951 (.881–.980) .833 (.597–.931) .999 (.997–.999) 1.000 (1.000–1.000)
Test–retest reliability RehaGait®
0 % slope
 Slow speed .995 (.986–.998) .968 (.913–.988) .945 (.852–.979) .941 (.843–.978)
 Normal speed .980 (.949–.992) .804 (.506–.923) .977 (.943–.991) .981 (.951–.992)
 Fast speed .952 (.871–.982) .833 (.552–.937) .953 (.873–.982) .972 (.925–.990)
15 % slope
 Slow speed .999 (.997–1.000) .866 (.651–.948) .960 (.896–.985) .959 (.895–.984)
 Normal speed .999 (.998–1.000) .932 (.823–.974) .946 (.860–.979) .927 (.810–.972)
 Fast speed .971 (.930–.988) .928 (.826–.970) .975 (.940–.990) .972 (.933–.988)
Test-retest reliability instrumented treadmill
0 % slope
 Slow speed .995 (.988–.998) .945 (.868–.977) .955 (.892–.981) .944 (.866–.977)
 Normal speed .990 (.977–.996) .960 (.904–.983) .976 (.941–.990) .982 (.956–.992)
 Fast speed .991 (.978–.996) .956 (.895–.982) .988 (.971–.995) .984 (.960–.993)
15 % slope
 Slow speed .996 (.991–.998) .908 (.779–.962) .935 (.843–.973) .930 (.831–.971)
 Normal speed .993 (.983–.997) .928 (.827–.970) .946 (.870–.978) .925 (.819–.969)
 Fast speed .996 (.991–.998) .962 (.909–.984) .972 (.933–.988) .970 (.927–.987)
  1. ICCs of data measured using both devices were used to determine validity. ICCs of data measured on the two separate days were used to determine the test-retest reliability of each system
  2. Normal speed – habitual walking speed; slow speed – 85 % normal walking speed; fast speed – 115 % normal walking speed