age of child at time of examination
Mother's age at time of examination
Mother's age at time of examination
Distance to the railway line (m)
distance to Value Trading (m)
wind direction
statistical sector
Study Area / Control Area
Child questionnaire complete
Mother questionnaire complete
Age of child at time of survey (year)- classes
Gender at birth
Season of sampling (child)
Month of sampling
Month of sampling
Month of sampling
Nationality Child at birth (Text)
Nationality Child at birth
Current nationality child (text)
Current nationality child
child attends education in Jewish school
Means of transport to go to school
Duration of travel (there and back) to school (in 4 categories)
Duration of travel (there and back) to school (in 3 categories)
Time active on electronic devices per week
Time to watch TV per week
Passive smoking: how often does a child smoke in a room at home?
Passive smoking: how often does a child smoke in a room elsewhere?
Passive smoking: how often does a child smoke in a room at home / elsewhere?
How many times a week is your child actively involved in sports (such as football, cycling, etc.) so that he/she sweats or is out of breath?
How often in free time outside in nature or terrain with fallow greenery
How often in free time outside in nature or terrain with fallow greenery
How often does the child do the following: wash hands
How often does child do the following: hand washing (binary)
How often does the child do the following: brush teeth
How often does the child do the following: wash hair
How often does child do the following: wash hair (binary)
How often does the child do the following: take a bath/shower
How often does the child do the following: change clothes
Does your child sometimes bite the nails?
Do you have a vegetable garden?
Does your child eat vegetables and/or fruit that come from your vegetable garden?
Does your child eat fruit and/or vegetables that you buy directly from or receive from a local grower (also family)?
Does your child sometimes eat eggs from their own chickens?
Does your child sometimes eat eggs that you buy directly from or get from a local breeder (also family) within the Singel of Antwerp?
Does your child sometimes eat eggs from their own chickens OR from a local breeder?
What kind of water does your child drink: water from the tap
What kind of water does your child drink: bottled water
What kind of water does your child drink: water from a groundwater well
Does your child drink tea that was prepared in a traditional metal teapot?
Does your child drink tea that was prepared in a traditional metal teapot? (binary)
Does your child eat dishes that were prepared in ceramic pots or bowls (e.g. tagine, etc.)?
Does your child eat dishes that were prepared in ceramic pots or bowls (e.g. tagine, etc.)? (binary)
Consumption of organ meat in the past 3 months
Consumption wild over the past 3 months
Child currently taking dietary supplements containing Vit D
Was the child breastfed?
For how long was your child breastfed?
Mother's age at time of examination
Mother's age at time of examination
mother's age at time of study (year)- classes
season of sampling (mother)
Month of sampling
Month of sampling
Month of sampling
What is your relationship with the child participating in the study?
How many children aged 0-14 do you have in your household?
How many children aged 15-18 does your household consist of?
How many adults does your household consist of?
How many people does your household currently consist of?
How many people does your household currently consist of? - Class
Number of family members on whom the equivalent income is calculated
Number of times the child's mother has been pregnant
Mother's Education (ISCED)
Nationality of the mother at birth (text)
Nationality of the mother at birth
Current nationality mother (text)
current nationality mother
Making ends meet (subjective): How easy or difficult is it for you to make ends meet with your household's total income per month?
Equivalent household income
Equivalised household income - categories
Type of property
Year of construction of the house in 5 categories categories
Year of construction of the house in 4 categories
Year of construction of the house in 3 categories
Is family owner of home
Have there been any road works in the street where you live in the past 3 months?
Renovation work on the house in the past 12 months?
Carpet tiles living room / kitchen / bedroom mother / bedroom child
Floor covering tiles living room / kitchen
Floor covering tiles bedroom participating mother
Floor covering tiles bedroom participating child
Carpet carpet living room / kitchen / bedroom mother / bedroom child
Carpet carpet living room / kitchen
Carpet carpet bedroom participating mother
Carpet carpet bedroom participating child
Carpet loose carpet living room / kitchen / bedroom mother / bedroom child
Carpet loose carpet living room / kitchen
Floor covering loose carpet bedroom participating mother
Carpet loose carpet bedroom participating child
Floor covering, parquet, living room / kitchen
Floor covering parquet bedroom participating mother
Floor covering parquet bedroom participating child
Floor covering planks living room / kitchen / bedroom mother / bedroom child
Floor covering shelves living room / kitchen
Floor covering planks bedroom participating mother
Floor covering planks bedroom participating child
Floor covering other (e.g. laminate, vinyl, ...) living room / kitchen / bedroom mother / bedroom child
Floor covering other (e.g. laminate, vinyl, ...) living room / kitchen
Floor covering other (e.g. laminate, vinyl, ...) bedroom participating mother
Floor covering other (e.g. laminate, vinyl, ...) bedroom participating child
How many times a week do you carry out the following activities: Dusting the living room with a dry cloth
How many times a week do you perform the following activities: Removing dust in the living room with a dry cloth (binary)
How many times a week do you carry out the following activities: Removing dust in the living room with a damp cloth
How many times a week do you perform the following activities: Removing dust in the living room with a damp cloth (binary)
How many times a week do you perform the following activities: knock out the living room rug
How many times a week do you perform the following activities: knock out the living room rug
How many times a week do you perform the following activities: sweeping or turning the living room?
How many times a week do you perform the following activities: sweeping or turning the living room (binary)
How many times a week do you perform the following activities: vacuuming the living room
How many times a week do you perform the following activities: Vacuuming the living room (binary)
How many times a week do you perform the following activities: mopping living room
How many times a week do you perform the following activities: mopping living room (binary)
How many times a week do you perform the following activities: scrubbing the living room, cleaning the carpet with shampoo
How many times a week do you carry out the following activities: washing living room windows
How many times a week do you perform the following activities: washing living room windows (binary)
How many times a week do you perform the following activities: kitchen cleaning
How many times a week do you perform the following activities: bathroom cleaning
How many times a week do you perform the following activities? Cleaning bedrooms
How many times a week do you carry out the following activities: sweeping the terrace
How many times a week do you perform the following activities: terrace sweeping (binary)
How many times a week do you carry out the following activities: Hose down the terrace
How many times a week do you perform the following activities: Hose down the terrace (binary)
Heating via stove (wood, gas, oil,...)  or fireplace ?
Type of stove used as heating
Frequency of use of stove or fireplace
Do you ever burn outside, e.g. an open fire or a fire pit?
Has there been heating outside in the immediate vicinity of your home in the past 3 months? 
Is smoking allowed in the house?
Participating mother smokes tobacco (3 cat)
Participating mother smokes tobacco (binary)
Pets in the house
cat or dog in the house
cat or dog / other pet with fur (e.g. rabbit, hamster, guinea pig, ...) in the home
bird in the house
Ventilation house - manual
ventilation house - grilles
Air exchange house - mechanical
Frequency of ventilation of the house by opening windows and/or exterior doors
Moisture problem in the house?
Do you suffer from mold formation in the house?
Sometimes draughts in the house?
Water pipe material - plastic (e.g. PVC); or others (Alluminium, Alpex, ...)
Water pipe material - copper
Material water pipes - lead
Do you have a garden or terrace?
Garden/terrace with tiles
Garden/terrace with grass
Garden/terrace with vegetable garden
Garden/terrace with bare ground
Groundwater well present in the garden
What footwear does your family mainly wear in the home?
Do the family members wipe their feet or shoes (on a doormat, among other things) when entering the house?
Do you wash all fruits and vegetables before use?
Do you have a vegetable garden? 
Is this vegetable garden part of your garden?
Consumption of fruit and vegetables from vegetable garden by participating mother
Do you eat fruit and/or vegetables that you buy directly from or receive from a local grower (also family)? 
Do you sometimes eat eggs that you buy directly from or receive from a local breeder (also family) within the Singel of Antwerp?
Do you sometimes eat eggs from your own chickens OR from a local breeder?
What kind of water do you drink: water from the tap
What kind of water do you drink: bottled water
What kind of water do you drink: water from a groundwater well
Do you drink tea that was prepared in a traditional metal teapot? (binary)
Do you eat dishes that were prepared in ceramic pots or bowls (e.g. tagine, ...)? (binary)
Organ meat consumption in the past 3 months (binary)
Consumption wild past 3 months (binary)
Has the doctor ever diagnosed you with an iron deficiency?
Does your doctor have an iron deficiency in the last 4 years? (2021-2024)
Does your doctor have an iron deficiency in the last 2 years? (2023-2024)
Are you currently taking dietary supplements? (e.g. vitamins, minerals (iron, zinc, ...), fish oil, omega-3 fatty acids, ...)
Have the following tests been carried out at the current address in the past? Soil Test
Have the following tests been carried out at the current address in the past? Water test
Have the following tests been carried out at the current address in the past? Testing vegetables/fruit from your own garden
Distance to Value Trading (km)
Distance to the railway line (km)
Distance to Value Trading (4 categories)
Distance to Value Trading (3 categories)
School Location
wind direction