def init_reports():
''' A reports container with initial values '''
reports = {}
for age_group in REPORTS_AGE_GROUPS.keys():
reports[age_group] = {}
for sex in ('male', 'female', 'total'):
reports[age_group][sex] = {}
for level in REPORTS_READING_LEVELS.keys() \
+ REPORTS_NUMERACY_LEVELS.keys() + ['total']:
reports[age_group][sex][level] = {'nb': 0, 'percent': None}
return reports
