Table 2 Comparison of the demographics, IBS symptoms and subtypes of the FD-IBS clinical overlap group with those of the IBS alone group

Demographics

   Age (years; $\overline{x}$ ± s.d.)

42.91 ± 14.61

43.63 ± 16.21

0.63

   Female Gender (%)

79(52.3)

194(59.0)

0.17

Severity score of abdominal pain or discomfort

2.95 ± 0.76

2.87 ± 0.81

0.34

Symptoms (%)

(score, $\overline{x}$ ± s.d.)

   <3 bowel movements/week

39(25.8)

79(24.0)

0.67

(1.52 ± 1.05)

(1.46 ± 0.96)

0.53

   >3 bowel movements/day

31(20.5)

71(21.6)

0.79

(1.33 ± 0.79)

(1.48 ± 1.06)

0.08

   Hard or lumpy stools

57(37.7)

109(33.1)

0.32

(1.92 ± 1.37)

(1.75 ± 1.23)

0.19

   Loose or watery stools

55(36.4)

134(40.7)

0.37

(1.73 ± 1.21)

(1.92 ± 1.34)

0.12

   Defecation straining

63(41.7)

121(36.8)

0.30

(2.04 ± 1.47)

(1.91 ± 1.39)

0.36

   Urgency

56(37.1)

136(41.3)

0.38

(1.87 ± 1.34)

(1.98 ± 1.39)

0.39

   A feeling of incomplete bowel movement

80(53.0)

156(47.4)

0.26

(2.26 ± 1.46)

(2.06 ± 1.37)

0.14

   Passing mucus

40(26.5)

84(25.5)

0.82

(1.40 ± 0.83)

(1.46 ± 0.96)

0.52

   Abdominal fullness, bloating or swelling

103(68.2)

212(64.4)

0.42

(2.66 ± 1.49)

(2.54 ± 1.48)

0.42

Overall score of abnormal bowel habit

16.74 ± 6.05

16.58 ± 5.05

0.78

Subtypes (%)

   IBS-C

43(28.5)

91(27.7)

0.85

   IBS-D

41(27.2)

116(35.3)

0.08

   IBS-M

14(9.3)

18(5.5)

0.12

   IBS-U

53(35.1)

104(31.6)

0.45