| Baseline sample (n = 12,787) | Follow-up sample (n = 1580) | p* |
---|---|---|---|
Demographic characteristics | |||
 Age, % (n) | |||
  16–24 | 19.1 (2439) | 11.9 (188) | < 0.001 |
  25–34 | 19.5 (2495) | 13.1 (207) | – |
  35–44 | 15.9 (2033) | 14.0 (221) | – |
  45–54 | 16.9 (2163) | 20.5 (324) | – |
  55–64 | 14.7 (1883) | 20.6 (325) | – |
  65+ | 13.9 (1774) | 19.9 (315) | – |
 Sex, % (n) | |||
  Men | 53.2 (6799) | 52.5 (829) | 0.227 |
  Women | 49.8 (5988) | 47.5 (751) | – |
 Social grade, % (n) | |||
  ABC1 | 40.3 (5156) | 43.5 (687) | < 0.001 |
  C2DE | 59.7 (7631) | 56.5 (893) | – |
Smoking characteristics | |||
 Exposure to e-cigarette use by others, % (n) | |||
  No | 74.2 (9484) | 74.6 (1179) | 0.688 |
  Yes | 25.8 (3303) | 25.4 (401) | – |
 Exposure to cigarette smoking by others, % (n) | |||
  No | 33.6 (4294) | 36.0 (569) | 0.002 |
  Yes | 66.4 (8493) | 64.0 (1011) | – |
 Own e-cigarette use†, % (n) | |||
  No | 80.4 (10284) | 79.0 (1248) | 0.416 |
  Yes | 19.6 (2503) | 21.0 (332) | – |
 Past quit attempt, % (n) | |||
  No | 71.8 (9178) | 71.0 (1122) | 0.203 |
  Yes | 28.2 (3609) | 29.0 (458) | – |
 High motivation to stop smoking, % (n) | |||
  No | 85.1 (10887) | 85.0 (1343) | 0.605 |
  Yes | 14.9 (1900) | 15.0 (237) | – |
 Prospective quit attempt, % (n) | |||
  No | NA | 67.9 (1073) | – |
  Yes | NA | 32.1 (507) | – |