Table 1 Baseline characteristics of study patients with abdominal pain at the emergency department
CharacteristicsUS (n = 392)No US (n = 391)
Mean (SD)n (%)Mean (SD)n (%)
Age47 (20)48 (19)
Sex
    Male160 (40.8)171 (43.7)
    Female232 (59.2)220 (56.3)
Length172 (9)172 (10)
Weight73 (16)73 (16)
Body mass index24.8 (4.5)24.8 (4.3)
Abdominal-related co-morbidity76 (19.4)78 (19.9)
Co-morbidity related to heart or diabetes66 (16.8)74 (18.9)
History of abdominal malignancy6 (1.5)12 (3.1)
History of other malignancy11 (2.8)14 (3.6)
Other co-morbidity132 (33.7)123 (31.5)
Admission for abdominal pain within1 year124 (32.0)137 (35.3)
Referral for admission92 (24.4)126 (32.9)
Duration of pain
    0–8 h44 (14.8)43 (14.4)
    8–24 h99 (33.2)97 (32.4)
    >24 h147 (49.3)151 (50.5)
    Cannot answer8 (2.7)8 (2.7)
Actual VAS (of pain)4.3 (2.8)4.4 (2.6)
Maximal recall VAS (of pain)7.6 (2.6)7.6 (1.8)
Temperature37.0 (0.8)37.0 (0.7)
Affected general condition90 (23.3)74 (19.1)
Tenderness338 (86.4)347 (89.2)
Rigidity51 (13.1)49 (12.6)
Palpable mass23 (5.9)29 (7.5)
  • US, ultrasound; VAS, visual analogue scale (scale 0–10 where 0 represents no pain at all and 10 represents unbearable pain).

  • US, ultrasound; VAS, visual analogue scale (scale 0–10 where 0 represents no pain at all and 10 represents unbearable pain).