Legislation may mandate staffing ratios (for example, 6 weeks to 12 months, 1:4; 12 to 18 months, 1:5; 18 to 24 months, 1:9; etc.). The caregiver-to-child ratio is one factor indicative of quality of care. Ratios vary greatly by location and by daycare center. Potential consequences of a caregiver:child ratio which is too high could be very serious . However, many states allow a higher numbers of toddlers to caregivers and some centers do not comply consistently. For example, within the US: Pennsylvania, ages 1–3, 1 teacher to 5 children; Missouri: age 2, 1 teacher to 8 children; North Carolina: 1 teacher to 10 children.