# checks demographics
def demogCheck():
    defaultFont = QFont("Tahoma", 13)
    boldFont = QFont("Tahoma", 13)
    boldFont.setBold(True)

    isInformationCorrect = True
    # checking age, if 0 - participant hasn't put age in, if under 18, tells them they are too young to take part
    # if over 18 then continue to next page
    if window.spinboxAge.value() == 0:
        window.labelAge.setFont(boldFont)
        window.errorAgeUnder18.hide()
        window.errorAge.show()
        isInformationCorrect = False
    elif window.spinboxAge.value() < 18:
        window.labelAge.setFont(boldFont)
        window.errorAge.hide()
        window.errorAgeUnder18.show()
        isInformationCorrect = False
    else:
        window.labelAge.setFont(defaultFont)
        window.errorAgeUnder18.hide()
        window.errorAge.hide()
    # checking if participant has selected any of the gender options, can only continue if an option is checked
    if (not window.buttonFemale.isChecked()) and (not window.buttonMale.isChecked()) and (not window.buttonOtherGender.isChecked()):
        window.labelGender.setFont(boldFont)
        window.errorGender.show()
        isInformationCorrect = False
    else:
        window.labelGender.setFont(defaultFont)
        window.errorGender.hide()
    # checking if participant has input an ethnicity, can only continue if text has been written in
    if window.lineeditEthnicity.text() == '':
        window.labelEthnicity.setFont(boldFont)
        window.errorEthnicity.show()
        isInformationCorrect = False
    else:
        window.labelEthnicity.setFont(defaultFont)
        window.errorEthnicity.hide()
    # checking if participant has selected one of the education options, can only continue if the index is not 0
    if window.comboEducation.currentIndex() == 0:
        window.labelEducation.setFont(boldFont)
        window.errorEducation.show()
        isInformationCorrect = False
    else:
        window.labelEducation.setFont(defaultFont)
        window.errorEducation.hide()
    # if all the demographics are filled in, taken to next page of stacked widget
    if isInformationCorrect:
        nextPage()