Table 1. Demographic information for participants in Studies 1, 2 and 3.
| Sample | Birkbeck Toddlers | Oxford Toddlers | VT Toddlers (longitudinal) | Children | Young Adults | Older Adults |
|---|---|---|---|---|---|---|
| N | 47(44)* | 39(38)** | 38 | 27 | 17 | 20 |
| Mean or % | Mean or % | Mean or % | Mean or % | Mean or % | Mean or % | |
| Age (months/years) | 29.68 mths | 24.03 mths | 18.27, 21.16 & 24.20 mths | 7.93 yrs | 22.88 yrs | 69.65 yrs |
| Sex | ||||||
| % Female | 56.82% (25/44) | 42.11% (16/38) | 44.74% (17/38) | 66.67% (18/27) | 82.35% (14/17) | 55.00% (11/20) |
| Ethnicity | ||||||
| White (British, Irish, American or Other) | 79.55% (35/44) | 76.32% (29/38) | 89.47% (34/38) | -- | -- | -- |
| Asian | 0.00% (0/44) | 0.00% (0/38) | 2.63% (1/38) | |||
| Afro-Caribbean | 2.27% (1/44) | 0.00% (0/38) | 0.00% (0/38) | -- | -- | -- |
| Other Black Background | 0.00% (0/44) | 0.00% (0/38) | 0.00% (0/38) | -- | -- | -- |
| Mixed—White and Asian | 9.09% (4/44) | 5.26% (2/38) | 0.00% (0/38) | -- | -- | -- |
| Mixed—White and Black | 2.27% (1/44) | 2.63% (1/38) | 7.89% (3/38) | -- | -- | -- |
| Other Mixed Background | 6.82% (3/44) | 2.63% (1/38) | 0.00% (0/38) | -- | -- | -- |
| Not provided | 0.00% (0/44) | 13.16% (5/38) | 0.00% (0/38) | -- | -- | -- |
| Highest level of education (adult participants) | ||||||
| GCSEs | -- | -- | -- | -- | 0.00% (0/17) | 70.00% (14/20) |
| A-levels | -- | -- | -- | -- | 82.35% (14/17) | 0.00% (0/20) |
| Degree / Higher National Diploma | -- | -- | -- | -- | 17.65% (3/17) | 15.00% (3/20) |
| Postgraduate degree / Doctorate | -- | -- | -- | -- | 0.00% (0/17) | 0.00% (0/20) |
| Not provided | -- | -- | -- | -- | 0.00% (0/17) | 15.00% (3/20) |
| Total years in education | -- | -- | -- | -- | 16 (17/17) | 12.78 (18/20) |
| Household Income | ||||||
| Under £15,000 | 2.27% (1/44) | 5.26% (2/38) | -- | 3.70% (1/27) | 29.41% (5/17) | 20.00% (4/20) |
| £15,000 - £30,000 | 0.00% (0/44) | 7.89% (3/38) | -- | 25.93% (7/27) | 35.29% (6/17) | 15.00% (3/20) |
| £30,000 - £45,000 | 0.00% (0/44) | 7.89% (3/38) | -- | 14.81% (4/27) | 23.53% (4/17) | 50.00% (10/20) |
| £45,000 - £60,000 | 9.09% (4/44) | 7.89% (3/38) | -- | 7.40% (2/27) | 5.88% (1/17) | 10.00% (2/20) |
| Over £60,000 | 68.18% (30/44) | 50.00% (19/38) | -- | 0.00% (0/27) | 0.00% (0/17) | 0.00% (0/20) |
| Not provided | 20.45% (9/44) | 21.05% (8/38) | -- | 48.15% (13/27) | 5.88% (1/17) | 5.00% (1/20) |
| Maternal Characteristics | ||||||
| Age (years)*** | 37.00 (36/44) | 36.03 (34/38) | 31.21 (38/38) | 35.00 (20/27) | -- | -- |
| Total years in education | 17.86 (44/44) | 17.27 (30/38) | 17.29 (38/38) | 14.42 (19/27) | -- | -- |
Note. Numbers in brackets indicate the frequency of a category/characteristic out of the total participant sample. *Three participants were excluded prior to analysis (2 boys and 1 girl), one due to experimenter error and two due to no video being recorded during the session; these participants are not included in the remainder of the table. **One participant (a girl) refused to engage with the Early Childhood Inhibitory Touchscreen task and is not included in the remainder of the table. ***For the Oxford and Birkbeck toddlers, maternal age was reported at the time of the test session (24-month and 30-month session, respectively); for the Virginia Tech (VT) toddlers, maternal age was reported at the child’s birth.—Indicates that this type of demographic data was not collected in this sample. (A larger version of this table can be found in S1 Table).