Table 4 Use of the SAFER pregnancy intervention^a

Care as usual

Nicotine patches

4 (36)

5 (33)

1(8)

Nicotine gum

0 (0)

2 (13)

0 (0)

Varenicline

0 (0)

1 (7)

0 (0)

E-cigarette

2 (18)

1 (7)

0 (0)

Quit-smoking coach

2 (18)

4 (27)

2 (15)

Group sessions

Median number of invitations for group sessions (IQR)

6 (4–6)

5 (5–6)

3 (1–4)

Median number of group sessions attended (IQR)

6 (3–6)

3 (2–4)

0 (0–1)

Median number of online group sessions attended (IQR)

0 (0–1)

1 (1–2)

0 (0–0)

Only attended live group sessions

5 (45)

3 (20)

3 (23)

Group sessions helped in smoking cessation^b

4 (3–5)

3 (3–4)

n.a

Group sessions helped in remaining abstinent^b

4 (3–5)

3 (2–4)

n.a

Online platform

Accessed platform

6 (55)

3 (20)

3 (23)

Platform helped in smoking cessation^b,c

3 (1.5–4)

2 (n.a.)

n.a

Incentives

Median monetary value in euros for filling out questionnaires provided per participant

120 (105–135)

120 (90–120)

0 (0–0)

Median monetary value in euros for smoking cessation provided per participant

55 (35–185)

0 (0–0)

0 (0–0)

Median times incentives were provided for smoking cessation based on biochemical validation

3 (1–5)

0 (0–0)

0 (0–0)

Median times incentives were provided for smoking cessation without biochemical validation

0 (0–1)

0 (0–0)

0 (0–0)

Individual incentives stimulated smoking cessation^b

4 (2–4)

3.5 (3–4)

n.a

Individual incentives helped in smoking cessation^b

3 (2–4)

3 (2–3.5)

n.a

Group incentives stimulated smoking cessation^b

3 (2–4)

3 (3–3)

n.a

Group incentives helped in smoking cessation^b

3 (2–4)

3 (2–3)

n.a

Would have participated without incentives

4 (3–4)

3.5 (3–4)

n.a

Personal contact with the researcher

Number of participants who initiated contact with the researcher

2 (18)

1 (7)

0 (0)

Overall study

Happy I participated^b

4 (4–5)

4 (4–5)

n.a

I would recommend participation to others^b

4 (4–5)

4 (4–5)

n.a

I made new friends due to participation^b

3 (3–3)

3 (2–3)

n.a