Variable

No. of patients

Systemic reaction (%)

Odd ratio
(95%CI)

P value

Age
0-14
15-75

60
633

3.3
12.6

4.2 (1-17.5)

0.03

Gender
Female
Male

402
291

11.9
11.7

1 (0.6-1.6)

0.92

Positive no. of allergen ( skin prick test)
3
4-

360
333

2.8
21.6

9.65(4.9-19.1)

<0.0001

No. of injections
1-20
21-

66
627

9.1
12.1

0.73(0.3-1.7)

0.47

Skin test to
HDM

Negative positive

282
411

7.1
15.1

2.3(1.4-3.9)

0.0001

Mold

Negative Positive

228
465

6.1
14.6

2.6(1.4-4.8)

0.0001

Grass

Negative Positive

525
168

10.7
15.5

1.5(0.9-2.5)

0.09

Trees

Negative Positive

558
135

8.2
23.7

3.5(2.1-5.6)

<0.0001

Bermuda

Negative Positive

631
162

8.9
16.0

2(1.2-3.2)

0.007

Mugworth

Negative Positive

573
120

9.1
25.0

3.3(2-5.5)

<0.0001

Chenopod

Negative Positive

594
99

9.8
24.2

2.9(1.7-5)

<0.0001

Plantain

Negative Positive

606
87

10.0
25.3

3.1(1.8-5.3)

<0.0001

Feather

Negative Positive

618
75

11.0
18.7

1.8(1-3.5)

0.05

Cat

Negative Positive

621
72

10.6
22.2

2.4(1.3-4.4)

0.003

Dog

Negative Positive

642
51

11.5
15.7

1.4(0.6-3.2)

0.37

Horse

Negative Positive

678
15

11.2
40.0

5.3(1.8-15.2)

0.004