Table 2
Frequency of ultrasound grades by observers (κ = 0.709)
Observer 2 ultrasound grades
1
2
3
4
Total
Observer 1 ultrasound grades
1
1
0
0
0
1
2
0
6
2
0
8
3
0
1
10
2
13
4
0
1
1
7
9
Total
1
8
13
9
31