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Table 1 Birch extract data from HollisterStier and Stallergenes Greer

From: Comparison of weight per volume and protein nitrogen units in non-standardized allergen extracts: implications for prescribing subcutaneous immunotherapy

BIRCH

Corresponding PNU/mL

HollisterStier (n = 13)

Stallergenes Greer (n = 5)

Wt/volume (1:100)

Wt/volume (1:200)

Wt/volume (1:100)

Wt/volume (1:200)

A

 Lowest value

2900.00

1450.00

4500.00

2250.00

 Highest value

4400.00

2200.00

5700.00

2850.00

 Mean

3569.23

1784.62

5100.00

2550.00

 St. deviation

519.44

259.72

477.49

238.75

BIRCH

Corresponding Diluent (mL)

HollisterStier (n = 13)

Stallergenes Greer (n = 5)

PNU (1000)

PNU (2000)

PNU (3000)

PNU (4000)

PNU (5000)

PNU (1000)

PNU (2000)

PNU (3000)

PNU (4000)

PNU (5000)

B

 Lowest value

290.00

145.00

96.67

72.50

58.00

450.00

225.00

150.00

112.50

90.00

 Highest value

440.00

220.00

146.67

110.00

88.00

570.00

285.00

190.00

142.50

114.00

 Mean

356.92

178.46

118.97

89.23

71.38

510.00

255.00

170.00

127.50

102.00

 St. deviation

51.94

25.97

17.31

12.99

10.39

47.75

23.87

15.92

11.94

9.55

  1. Corresponding PNU concentrations for a weight per volume of 1:100 and 1:200 are shown A, while corresponding diluent volumes for PNUs values from 1000 to 5000 are shown in B
  2. These volumes represent the amount of diluent or buffer added to 1 g of allergen