Table 2: Descriptive characteristics and effect sizes for mobility outcomes by BMI classification.

OutcomeDescriptive characteristicsEffect sizes
Normal weightOverweightObeseNormal Normal Overweight
versus
Overweight
versus
Obese
versus
Obese

Walking performance
 T25FW, s7.1 (4.3)6.9 (5.1)6.2 (2.2).05.29.18
 6MW, m396.4 (175.4)438.4 (131.7)422.2 (100.3)−.27−.19.14
Walking cost
, mL/kg/m0.256 (0.136)0.221 (0.144)0.202 (0.046).25.62.20
Spatiotemporal gait
 Velocity, cm/s97.1 (30.8)105.6 (28.9)107.1 (29.9)−.28−.33−.05
 Cadence, steps/min100.6 (14.9)103.6 (17.8)105.5 (14.7)−.19−.33−.12
 Step length, cm56.5 (13.2)60.0 (11.5)59.5 (12.0)−.28−.24.04
 Step time, s0.624 (0.116)0.618 (0.196)0.588 (0.095).04.34.21
 Double support, gait cycle (%)32.5 (6.2)31.6 (6.9)32.8 (5.7).13−.05−.18
 Single support, gait cycle (%)34.2 (3.6)34.3 (3.4)33.7 (2.9)−.03.17.21
 Base of support, cm12.3 (5.1)11.7 (3.6)12.4 (3.6).13−.02−.18
Self-reported walking
 MSWS-1245.8 (32.0)40.5 (27.8)42.3 (26.3).18.12−.07
Free-living activity
 Daily step count3951.0 (2404.1)4701.1 (2913.8)3953.6 (1926.6)−.28−.001.31
 Daily movement count139562.7 (88691.9)154247.3 (95943.1)139566.3 (67516.0)−.16<.001.18

Values are mean (SD). BMI: body mass index; T25FW: timed 25-foot walk; 6MW: 6-minute walk; : oxygen cost of walking; MSWS-12: Multiple Sclerosis Walking Scale-12.