Table 1 Food items associated with illness by univariate analysis

Cold appetizer—fried fish

157 (92.9)

88 (80.0)

3.27 (1.54–6.93)

0.001

Cold appetizer—salted jellyfish

130 (77.4)

68 (61.3)

2.16 (1.28–3.66)

0.004

Cold appetizer—pork liver

157 (92.9)

81 (73.0)

4.85 (2.36–9.97)

<0.001

Cold appetizer—spring roll

144 (85.7)

78 (70.3)

2.54 (1.40–4.60)

0.002

Cold appetizer—sliced fried duck

129 (77.3)

66 (59.5)

2.31 (1.37–3.90)

0.02

Buddha jumping over the wall^a

156 (92.3)

97 (87.4)

1.73 (0.78–3.84)

0.17

Steamed rice cake with shrimps

159 (94.1)

94 (84.7)

2.88 (1.26–6.54)

0.01

Stewed bamboo shoot

161 (95.8)

98 (88.3)

3.05 (1.18–7.91)

0.02

Steamed fish

147 (87.5)

83 (74.8)

2.36 (1.26–4.42)

0.006

Lamb chops, carrots, radish wrapped in lotus leaves

141 (83.9)

65 (59.1)

3.62 (2.06–6.33)

<0.001

Salted boiled shrimps

145 (86.3)

72 (64.9)

3.41 (1.90–6.15)

<0.001

Braised pork

130 (78.3)

66 (60.0)

2.41 (1.42–4.09)

0.001

Guabao (steamed sandwich)

141 (83.4)

83 (74.8)

1.70 (0.94–3.06)

0.08

Coriander

92 (54.8)

45 (40.5)

1.78 (1.09–2.89)

0.02

Mashed garlic

100 (59.5)

46 (41.4)

2.08 (1.28–3.38)

0.003

Rib soup with Chinese yam

132 (78.6)

73 (65.8)

1.91 (1.11–3.27)

0.02

Butter Swiss roll

120 (71.4)

64 (57.7)

1.84 (1.11–3.04)

0.02

Cherry tomato

92 (54.4)

49 (44.1)

1.51 (0.93–2.45)

0.09

Sliced orange

96 (57.1)

50 (45.1)

1.63 (1.00–2.64)

0.05