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Table 2 Characteristics of 13 studies applying leukocyte esterase (LE) strip for meta-analysis

From: Reliability of synovial fluid alpha-defensin and leukocyte esterase in diagnosing periprosthetic joint infection (PJI): a systematic review and meta-analysis

Study, year

Country

Participants (M/F)

Median age (range, years)

Standard reference

Study design

Assay platform

Cutoff value

Parvizi et al. 2011&

USA

UA (108)

UA

Own institute#

P

Chemstrip 7 urine test strip (Roche Diagnostics, Indianapolis, Indiana)

++ (+)*

Tischler et al. 2014

USA

90/99

63 (22–90)

MSIS

P

UA

++ (+)*

Deirmengian et al. 2014ζ

USA

28/18

63/67

MSIS

R

Chemstrip 7 urine test strip (Roche Diagnostics, Indianapolis, IN)

++/+

Guenther et al. 2014&

Germany

UA (353)

67 (56–78)

MSIS

P

Roche Diagnostics GmbH, Mannheim, Germany

++/+

Colvin et al. 2015&

USA

27/30

69.1 (31–91)

AAOS

P

Chemstrip 7 urine test strips (Roche Diagnostics, Indianapolis, IN)

++

Tischler et al. 2016

USA

30/31

64.1 (45–80)

MSIS

P

UA

++

De Vecchi et al. 2016

Italy

UA (129)

64 (17–88)

MSIS

P

Dirui Industrial Co Ltd., China

++/+

Ruangsomboon et al. 2017

Thailand

11/35

69 (61–77)

ICM criteria

R

Chemstrip 10 urine test strip; Roche Diagnostics, Indianapolis, Indiana

++

Koh et al. 2017

Korea

13/47

71 (50–85)

MSIS

P

AUTION ELEVEN, ARKRAY, Kyoto, Japan; Clinitek 500, Siemens, Munich, Germany; and Urisys 2400, Roche Diagnostics, Mannheim, Germany

++

Li et al. 2017

China

27/36

57.2 (22–80)

MSIS

P

Comber 10 Test M Roche (Germany)

++

Wang et al. 2017

China

UA

63 (51–75)

MSIS

R

Combur10 TestM Roche, Germany; AUTION Sticks, Arkray, Kyoto, Japan

++

Li et al. 2018

China

81/117

62 (48–76)

MSIS

P

AUTION Sticks, Arkray, Kyoto, Japan

++/+

  1. UA unavailable, P prospective study, R retrospective study, ELISA enzyme-linked immunosorbent assay, ICM International Consensus Meeting
  2. *Both ++ and ++/+ as cutoff value were analyzed for the sensitivity, specificity, positive predictive value, and negative predictive value
  3. #Similar to MSIS
  4. &Blood samples excluded
  5. ζBoth bloody and non-bloody samples were analyzed for the sensitivity, specificity, positive predictive value, and negative predictive value, but only non-bloody samples were included in the meta-analysis