Table 2 Intra-rater reliability of measures of abdominal muscle thickness in three positions.

From: Prolonged sitting-induced back pain influences abdominal muscle thickness in a sitting but not a supine position

 

ICC

95%CI

SEM

MDD

TrA

Supine

0.990

0.982, 0.994

0.021

0.058

Usual sitting

0.990

0.983, 0.994

0.034

0.093

Upright sitting

0.968

0.945, 0.981

0.048

0.133

IO

Supine

0.995

0.990, 0.997

0.025

0.070

Usual sitting

0.994

0.990, 0.997

0.035

0.097

Upright sitting

0.994

0.990, 0.997

0.031

0.086

EO

Supine

0.992

0.986, 0.995

0.025

0.068

Usual sitting

0.992

0.985, 0.995

0.028

0.077

Upright sitting

0.988

0.978, 0.993

0.035

0.098

  1. ICC intrarater intraclass coefficient, CI confidence interval, SEM standard error of measurement, MDD minimal detectable difference, TrA transverse abdominis muscle, IO internal oblique muscle, EO external oblique muscle.
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