Table 3 Early Dynamic Ultrasound study techniques

Andersson [27]

ADUS

Yes

Week 1

4/52

<2 mm

2–4 mm

>4 mm

✔

0–4 mm

Finnbogasan [2]

ADUS

Yes

10–14 days

✔

✔

✔

Visual assessment

Afaq [28]

ADUS

Yes

Week 1

2/52 or 8/12

✔

✔

✔

✔

Harcke [29]

ADUS

No

Week 1

Reg-8/52

✔

✔

✔

✔

Visual assessment

Gomes [1]

L & ADUS

No

Week 1

4/52 and 3/12

1–2 mm

2–4 mm

4–5 mm

5 mm

Woolacott [19]

L & ADUS

Yes

Week 1

6/12 to 1 year

✔

✔

✔

Functional measure

Finnbogasan [15]

L & ADUS

No

Birth-3/12

✔

✔

✔

✔

Visual and measured

Paton [22]

L & ADUS

No

2/52 cl. Inst.

8/52 + risk fact

✔

✔

✔

✔

% cover α angle

Bache [25]

LDUS

Yes

Week 1

2–6/52

✔

✔

✔

✔

Visual and measured

Holen [16]

LDUS

Yes

Day 3

2/52

✔

✔

✔

✔

% cover α angle

Rosendahl [23]

LDUS

Yes

Day 4

6/52

≥60°

≤50°

≤43°

<43°

α angle

Elbourne [26]

LDUS

No

2–6/52

8/52

✔

✔

✔

✔

% cover α angle

Clarke [24]

LDUS

Yes

10/7 or 6/52

12/52

✔

✔

✔

✔

% cover α angle

Rosendahl [20]

LDUS

No

Week 1

Reg-8/52

✔

✔f/u 2/52

✔f/u 3/52

✔

Chan [21]

LDUS

No

6/52

✔

✔

✔

✔

% cover α angle

Kaisjer [30]

ADUS

Yes

1 to 2 weeks

6/52 to 4/12

✔

✔

✔

measured

Reikeras [31]

LDUS

Yes

2–4/52

2 and 16 weeks

✔

✔

✔

measured

Shipman [9]

LDUS

No

Birth-6/12

2 years

✔

✔

✔

Functional measure

Shorter [18]

LDUS

Yes

Birth-4/12

1 year

✔

✔

✔

measured