Table 1.
Summary statistics
| Var Name | Description | N | Mean | SD |
|---|---|---|---|---|
| FSIQ | Full-Scale Intelligence Quotient (FSIQ) score | 1320 | 95.095 | 10.509 |
| Female | Females are assigned a value of 1, and males 0 | 1320 | 0.491 | 0.500 |
| Sibling structure | ||||
| Number of siblings | The number of siblings of the child | 1320 | 0.861 | 0.613 |
| Only child | Equals 1 if the student is an only child; 0 otherwise | 1320 | 0.256 | 0.437 |
| Have older brothers | Children with older brothers are assigned a value of 1, otherwise 0 | 1320 | 0.237 | 0.425 |
| Have older sisters | Children with older sisters are assigned a value of 1, otherwise 0 | 1320 | 0.287 | 0.453 |
| Have younger brothers | Children with younger brothers are assigned a value of 1, otherwise 0 | 1320 | 0.155 | .362 |
| Have younger sisters | Children with younger sisters are assigned a value of 1, otherwise 0 | 1320 | 0.135 | 0.342 |
| Have older brothers within three years | Children with older brothers within three years of age are assigned a value of 1, 2 = have older brother over three years, otherwise 0 | 1320 | 0.055 | 0.227 |
| Have older sisters within three years | Children with older sisters within three years of age are assigned a value of 1; 2 = have older sisters over three years, otherwise 0 | 1320 | 0.090 | 0.287 |
| Have younger brother within three years | Children with younger brothers within three years of age are assigned a value of 1, 2 = have younger over three years, otherwise 0 | 1320 | 0.088 | 0.283 |
| Have younger sisters within three years | Children with younger sisters within three years of age are assigned a value of 1, 2 = have younger sister over three years, otherwise 0 | 1320 | 0.074 | 0.262 |
| The oldest of siblings | The children who are the eldest are assigned a value of 1, otherwise 0 | 1320 | 0.231 | 0.422 |
| The youngest of siblings | The children who are the youngest are assigned a value of 1, otherwise 0 | 1320 | 0.460 | 0.499 |
| The middle siblings | The children who are in the middle are assigned a value of 1, otherwise 0 | 1320 | 0.053 | 0.224 |
| Child and Family Characteristics | ||||
| Baseline BSID score | Standardized Bailey cognitive score for baseline | 1320 | −0.009 | 0.999 |
| Age (month) | Children’s age at the time of data collection (in months) | 1320 | 66.097 | 6.316 |
| Mother is the primary caregiver | Whether the mother is the primary caregiver | 1320 | 0.572 | 0.495 |
| Premature birth | Whether the child was born prematurely | 1320 | 0.040 | 0.198 |
| Age of mother | Mothers’ age | 1320 | 32.273 | 4.929 |
| Mother completed high school | Children whose mothers have a high school degree or higher are assigned a value of 1; otherwise, 0 | 1320 | 0.198 | 0.399 |
| The primary caregiver completed high school | Children whose primary caregivers have a high school degree or higher are assigned a value of 1, otherwise 0 | 1320 | 0.039 | 0.195 |
| Family asset | The ordinal categorization of the family asset index into three levels based on an average distribution of assets:1 = low 2 = medium 3 = high. The family asset index is constructed using polychoric principal components on the following variables: tap water, toilet, water heater, washing machine, computer, Internet, refrigerator, air conditioner, motor or electric bicycle, and car | 1320 | 2.043 | 0.815 |
| Parenting/Educational Investment | ||||
| Read books or look at picture books with child | The caregivers have read books or looked at picture books with child for the past three days are assigned a value of 1, otherwise 0 | 1320 | 0.611 | 0.488 |
| Sing songs with child | The caregivers who have sung with the child for the past three days are assigned a value of 1, otherwise 0 | 1320 | 0.462 | 0.499 |
| Tell stories to child | The caregivers who have told stories to the child for the past three days are assigned a value of 1, otherwise 0 | 1320 | 0.433 | 0.496 |
| Play with child | The caregivers who have played games with the child for the past three days are assigned a value of 1, otherwise 0 | 1320 | .752 | .432 |
| Positive parenting behaviours | Whether the caregivers have three positive parenting behaviours or above | 1320 | 2.258 | 1.347 |
| Cost of purchasing vitamins | Log transformation of cost of purchasing vitamins for children | 1320 | 2.716 | 2.704 |
| Cost of enrolling in extracurricular classes | Log transformation of cost of enrolling in extracurricular classes for children | 1320 | .705 | 2.085 |
| Cost of purchasing toys | Log transformation of cost of purchasing toys for children | 1320 | 4.227 | 2.045 |
| Cost of purchasing books | Log transformation of cost of purchasing books for children | 1320 | 3.593 | 2.04 |
| Investment in material resources | Log transformation of cost of purchasing material resources for children | 1320 | 5.628 | 1.613 |
| Expected level of education | The level of education expected by the caregiver: 1 = junior high school 2 = high school 3 = Technical secondary school, vocational school, secondary technology 4 = university Specialty 5 = University Specialty | 1320 | 0.904 | 0.295 |
| Project treatment | Children who received the project treatment are assigned a value of 1, otherwise 0 | 1320 | 0.535 | 0.499 |