Table 2 ADA analysis and correlation with study variables for different subgroups

Gender

Mean ADA

(IU/L)

Male

66 ± 50

p = 0.712

98 ± 37

p = 0.364

35 ± 42

P = 0.067

Female

63 ± 52

106 ± 32

17 ± 16

Race

Mean ADA

(IU/L)

  Chinese

52 ± 48

p < 0.001

95 ± 37

p = 0.306

27 ± 33

P = 0.121

  Malay

73 ± 43

95 ± 36

38 ± 27

  Indian

94 ± 47

113 ± 28

19 ± 18

  Others

110 ± 48

110 ± 36

115 ± 95

ADA level

According to age

(IU/L)

  Age ≤ 55 years

92 ± 47

P < 0.001

107 ± 33

P = 0.002

56 ± 57

P = 0.000

  Age > 55 years

34 ± 34

79 ± 34

19 ± 15

Age corr coeff (r)

r = −0.621

p < 0.001

r = −0.281

p = 0.011

r = −0.556

P = 0.000

Fluid

Corr coeff (r)

  Protein

r = 0.556

p < 0.001

r = 0.442

p < 0.001

r = 0.343

P = 0.02

  LDH

r = 0.427

p < 0.001

r = 0.473

p < 0.001

r = 0.836

P = 0.000

  Cell count

r = 0.237

p = 0.003

r = 0.160

p = 0.162

r = 0.573

P = 0.000

  Lymphocytes

r = 0.314

p < 0.001

r = 0.116

p = 0.305

r = 0.534

P = 0.000