Table 1.
Participant Characteristics (Percentages Have Been Rounded so may not Equal Exactly 100%)
| Characteristic | Number | % |
|---|---|---|
| Age band (y) | ||
| 18–21 | 6 | 33 |
| 22–25 | 5 | 28 |
| 26–29 | 3 | 17 |
| ≥30 | 3 | 17 |
| Missing | 1 | 6 |
| Ethnic group | ||
| White British | 17 | 94 |
| White European | 1 | 6 |
| Household socioeconomic classification (using NS-SEC, 8 level classification with seven being the lowest and eight unemployed) | ||
| 5 | 1 | 6 |
| 7 | 10 | 56 |
| 8 | 7 | 39 |
| Number of previous pregnancies | ||
| 1 | 14 | 78 |
| 2 | 2 | 11 |
| 3 | 1 | 6 |
| 4 | 1 | 6 |
| Smoking rate prior to scan and CO test (cigarettes per day) | ||
| 0 | 0 | 0 |
| 1–5 | 2 | 11 |
| 6–10 | 4 | 22 |
| 11–15 | 5 | 28 |
| 16–20 | 5 | 28 |
| ≥21 | 2 | 11 |
| Smoking rate following scan and CO test but prior to delivery (cigarettes per day) | ||
| 0 | 4 | 22 |
| 1–5 | 3 | 17 |
| 6–10 | 6 | 33 |
| 11–15 | 3 | 17 |
| 16–20 | 0 | 0 |
| ≥21 | 2 | 11 |
| Referral to SSS category | ||
| Accepted referral to SSS | 12 | 66 |
| Rejected referral to SSS | 6 | 33 |
CO = carbon monoxide; SSS = Stop Smoking Services.