Duration

Group 1

Group 2

Group 3

Group 4

Range

1 - 8

1 - 9

1 - 9

1 - 8

Mean ± SD

3.63 ± 0.96

3.61 ± 1.33

3.92 ± 1.61

3.42 ± 1.01

F test

0.879

P value

0.453