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. 2005 Sep 8;15(2):165–173. doi: 10.1007/s00586-005-0942-2

Table 2.

Intraobserver–intermethod reliability

  Mean of mean differences (°)
Mean difference (°) between two measurement-sets [Range of means]a 		P valueb (range) Pearson’s correlation coefficient mean (range) 95%-C.I.c (°)
Spike method versus fin method
 O-I versus O-I −0.40
Inline graphic 		Inline graphic 0.924
Inline graphic 		−2.4/+3.2
Spike method versus fin method
 O-II versus O-II −0.73
Inline graphic 		Inline graphic 0.882
Inline graphic 		−2.9/+4.3

O-I experienced observer 1, O-II inexperienced observer 2

aThe values for each possible measurement combination is listed (e.g. O-I-first measurement with the spike method versus O-I-first measurement with the fin method, O-I-first Spike versus O-I-second fin, O-I-second-Spike versus O-I-first-Fin, O-I-second-Spike versus O-I-second fin. The same was true for O-II)

bUnpaired t test (the values for each possible combination of data set as described in a)

c95% Confidence interval around the mean difference