Table 5 Subgroup analysis with a multiple linear regression analysis to compare the differences in hospital costs (USD) and LOS (days) between LIP and NP patients

Gender

 Male

37

13

0.004

0.57

0.09

< 0.001

 Female

96

14

< 0.001

0.19

0.08

0.013

Age (years)

 0–14 y/o

−40

18

0.031

−0.20

0.12

0.086

 15–29 y/o

45

11

< 0.001

0.02

0.07

0.819

 30–44 y/o

144

17

< 0.001

0.34

0.06

< 0.001

 45–59 y/o

274

31

< 0.001

1.39

0.19

< 0.001

 60 y/o or more

234

48

< 0.001

1.83

0.26

< 0.001

Perforated appendicitis

 No

37

8

< 0.001

0.26

0.05

< 0.001

 Yes

133

25

< 0.001

0.68

0.15

< 0.001