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Table 1 Baseline characteristics of recruited participants in various years

From: Prevalence and distribution patterns of allergens among children with asthma and asthma-like symptoms in Shanghai, China

Year

N

Boy/girl

Age

Father

Mother

F-M

None

     

2010

467

281/186

4.00 (3.00,5.50)

128

109

22

208

     

2011

341

200/141

4.00 (3.00,5.50)

105

73

33

130

     

2012

293

169/124

4.50 (3.50,6.50)

91

80

29

93

     

2013

178

103/75

4.50 (3.63,6.00)

64

35

17

62

     

2014

331

209/122

4.50 (3.50,6.00)

110

95

29

97

     

2015

279

163/116

4.50 (3.50,6.50)

107

66

20

86

     

2016

432

260/172

5.00 (4.00,6.50)

122

128

56

126

     

2017

551

298/253

5.00 (3.50,6.25)

170

129

57

195

     

2018

607

339/268

5.00 (4.00,7.00)

177

164

86

180

     

Total

3479

2022/1457

4.50 (3.50,6.00)

1074

879

349

1177

     

Year (N)

Total (N)

DF (N)

HDM (N)

Cat fur (N)

Dog fur (N)

RP (N)

WP (N)

Shrimp (N)

Crab (N)

Egg (N)

Milk (N)

Cashew (N)

2010

467

250

241

168

163

86

57

63

46

10

5

28

2011

341

176

176

143

128

80

40

21

20

8

3

10

2012

293

163

162

116

112

111

56

17

14

7

4

17

2013

178

87

89

67

64

76

42

7

8

5

4

5

2014

331

190

194

138

129

169

67

39

41

12

6

7

2015

279

127

129

86

87

123

61

18

18

13

6

5

2016

432

215

223

139

137

189

85

15

20

14

3

7

2017

551

257

255

125

125

217

94

13

21

21

10

11

2018

607

309

307

176

172

261

118

17

13

12

11

11

Total

3479

1774

1776

1158

1117

1312

620

210

201

102

52

101

  1. Age: median (Q1, Q3), Family allergy history (Father: father allergy only, Mother: mother allergy only, F-M: both of father and mother allergy, none: neither of father nor mother allergy)
  2. DF dermatophagoides farinae, HDM house dust mite, RP ragweed, WP willow