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Table 1 Inter-rater agreement with respect to general and parenchymal findings for each coding system (n = 258)

From: Inter-rater agreement in the assessment of abnormal chest X-ray findings for tuberculosis between two Asian countries

Item

Coding

Inter-rater agreement

 

system

Kappa with 95% confidence interval and the absolute number of films (--/-+/+-/++)

  

JP-JP

JP-VN

   

VN-VN

   

[1]

[2]

[3]

[4]

 

Total number

JVCS

(245)

(246)

(245)

(245)

(244)

(255)

of tested films

CRRS

(245)

(245)

(246)

(246)

(245)

(255)

Parenchymal

JVCS

NA

NA

NA

NA

NA

NA

abnormality

CRRS

0.63 [0.51-0.75]

0.24 [0.16-0.32]

0.50 [0.38-0.62]

0.25 [0.16-0.34]

0.58 [0.46-0.70]

0.27 [0.17-0.37]

  

(32/21/7/185)

(9/44/0/192)

(24/29/6/187)

(7/32/2/205)

(22/17/8/198)

(6/3/24/222)

Calcification*

JVCS

0.62 [0.49-0.75]

0.47 [0.35-0.59]

0.21 [0.12-0.30]

0.55 [0.42-0.68]

0.30 [0.21-0.39]

0.26 [0.17-0.35]

  

(188/13/14/30)

(187/14/22/23)

(198/2/38/7)

(190/12/18/25)

(201/0/34/9)

(215/2/31/7)

 

CRRS

0.28 [0.15-0.41]

0.35 [0.23-0.47]

0.15 [0.04-0.26]

0.36 [0.25-0.47]

0.36 [0.25-0.47]

0.17 [0.09-0.25]

  

(219/10/11/5)

(206/23/6/10)

(226/4/14/2)

(208/23/5/10)

(228/2/11/4)

(219/2/30/4)

Pleural

JVCS

0.58 [0.45-0.71]

0.77 [0.64-0.90]

0.66 [0.54-0.78]

0.64 [0.51-0.77]

0.54 [0.41-0.67]

0.73 [0.61-0.85]

effusion

 

(222/8/5/10)

(226/5/2/13)

(222/8/3/12)

(221/6/6/12)

(217/9/7/11)

(230/6/4/15)

Pleural

JVCS

0.35 [0.23-0.47]

0.22 [0.14-0.30]

0.45 [0.33-0.57]

0.28 [0.18-0.38]

0.45 [0.32-0.58]

0.31 [0.22-0.40]

thickening

 

(158/39/19/29)

(88/110/2/46)

(161/36/14/34)

(84/93/6/62)

(148/28/26/42)

(87/4/95/69)

Pleural

CRRS

0.30 [0.20-0.40]

0.16 [0.09-0.23]

0.46 [0.34-0.58]

0.45 [0.33-0.57]

0.54 [0.42-0.66]

0.32 [0.22-0.42]

abnormalities

 

(130/73/6/36)

(83/120/3/39)

(159/44/7/36)

(76/60/10/100)

(124/12/42/67)

(81/6/91/77)

Pleural effusion/

CRRS

0.48 [0.36-0.60]

0.34 [0.22-0.46]

0.55 [0.43-0.67]

0.49 [0.36-0.62]

0.67 [0.55-0.79]

0.48 [0.36-0.60]

thickening**

 

(176/35/6/28)

(168/43/11/23)

(189/22/9/26)

(156/26/23/41)

(176/6/22/41)

(173/14/33/35)

  1. * In CRRS, calcification here indicates calcified granuloma only
  2. **In CRRS, pleural effusion and thickening are combined
  3. JVCS Japan-Vietnam chest X-ray coding system, CRRS chest radiograph reading and recording system, TB tuberculosis, NA not applicable, JP-JP a comparison between the Japanese raters; JP-VN [1] to [4] comparisons between Japanese-Vietnamese raters, VN-VN a comparison between the Vietnamese raters, (--/-+/+-/++) (negative findings by both raters/positive findings only by the second rater/positive findings only by the first rater/positive findings by both raters)