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Table 1 Baseline characteristics of patients with abdominal pain at the ED

From: Patient factors influencing the effect of surgeon-performed ultrasound on the acute abdomen

Characteristics Ultrasound (n = 392) Non-ultrasound (n = 391)
Mean SD n % Mean SD n %
Age 47 20    48 19   
Height 172 9    172 10   
Weight 73 16    73 16   
BMI (body mass index) 24.8 4.5    24.8 4.3   
Gender
 Male    160 40.8    171 43.7
 Female    232 59.2    220 56.3
Abdominal related comorbidity    76 19.4    78 19.9
Comorbidity related to heart or diabetes    66 16.8    74 18.9
History of abdominal malignancy    6 1.5    12 3.1
History of other malignancy    11 2.8    14 3.6
Other comorbidity    132 33.7    123 31.5
Admission for abdominal pain within 1 year    124 32.0    137 35.3
Referral for admission    92 24.4    126 32.9
Duration of pain
 0–8 h    44 14.8    43 14.4
 8–24 h    99 33.2    97 32.4
 >24 h    147 49.3    151 50.5
 Cannot answer    8 2.7    8 2.7
Affected general condition    90 23.3    74 19.1
Tenderness    338 86.4    347 89.2
Rigidity    51 13.1    49 12.6
Palpable mass    23 5.9    29 7.5
Actual VAS (of pain)a 4.3 2.8    4.4 2.6   
Maximal anamnestic VAS (of pain)a 7.6 2.6    7.6 1.8   
Temperature 37.0 0.8    37.0 0.7   
  1. aVAS (of pain) = Visual Analogue Scale (scale 0–10, 0 represents no pain at all, 10 represents unbearable pain)