Table 1.
Distribution of socio-demographic factors by maternal and partner smoking status during pregnancy
| Mother smoked during pregnancy | P-value | Partner smoked during pregnancy | P-value | |||
|---|---|---|---|---|---|---|
| Yes (n = 1219) | No (n = 5265) | Yes (n = 2082) | No (n = 4402) | |||
| n (%) | n (%) | n (%) | n (%) | |||
| Maternal education | ||||||
| CSE | 293 (24) | 539 (10) | 370 (18) | 462 (11) | ||
| Vocational | 144 (12) | 400 (8) | 219 (11) | 325 (7) | ||
| O-level | 445 (37) | 1800 (34) | 779 (37) | 1466 (33) | ||
| A-level | 251 (21) | 1496 (28) | 494 (24) | 1253 (28) | ||
| Degree or above | 86 (7) | 1030 (20) | <0.001 | 220 (11) | 896 (20) | <0.001 |
| Housing | ||||||
| Mortgaged/owned | 799 (65) | 4649 (88) | 1516 (73) | 3932 (89) | ||
| Private rented | 127 (10) | 210 (4) | 169 (8) | 168 (4) | ||
| Council rented | 250 (21) | 288 (5) | 333 (16) | 205 (5) | ||
| Other | 43 (4) | 118 (2) | <0.001 | 64 (3) | 97 (2) | <0.001 |
| Household social class | ||||||
| 1 | 79 (7) | 991 (20) | 185 (9) | 885 (21) | ||
| 2 | 457 (40) | 2325 (46) | 829 (43) | 1953 (46) | ||
| 3 (non-manual) | 297 (26) | 1196 (24) | 530 (27) | 963 (23) | ||
| 3 (manual) | 210 (19) | 399 (8) | 286 (15) | 323 (8) | ||
| 4 | 74 (7) | 137 (3) | 103 (5) | 108 (3) | ||
| 5 | 15 (1) | 15 (0.3) | <0.001 | 16 (1) | 14 (0.3) | <0.001 |
| Parity | ||||||
| 0 | 587 (48) | 2486 (47) | 966 (46) | 2107 (48) | ||
| 1 | 403 (33) | 1908 (36) | 729 (35) | 1582 (36) | ||
| 2+ | 229 (19) | 871 (17) | 0.05 | 387 (19) | 713 (16) | 0.06 |
| Maternal heaviness | ||||||
| None | 0 (0) | 5265 (100) | 1258 (61) | 4007 (91) | ||
| Light smoker | 512 (42) | 0 (0) | 330 (16) | 182 (4) | ||
| Heavy smoker | 694 (58) | 0 (0) | 490 (24) | 204 (5) | ||
| Partner heaviness | ||||||
| None | 386 (32) | 4007 (76) | 0 (0) | 4393 (100) | ||
| Light smoker | 162 (13) | 439 (8) | 601 (29) | 0 (0) | ||
| Heavy smoker | 658 (55) | 819 (16) | 1477 (71) | 0 (0) | ||
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |||
| Maternal age (years) | 27.7 (4.9) | 29.5 (4.4) | <0.001 | 28.3 (4.9) | 29.6 (4.3) | <0.001 |
P-values derived from χ2 tests for categorical variables and t-tests for continuous variables. SD = standard deviation; CSE = certificate of secondary education; O-level = general certificate of education ordinary level; A-level = general certificate of education advanced level.