The indexes are intended only to help identify an event for an individual and enable you to purchase a copy certificate. The index information always includes the full name, event, year and quarter of the event's registration, plus the reference to the volume and page containing the entry. Later entries added more information to help identify the correct person, so you may find the mother's maiden name with a birth entry after 1911; marriages including the surname of the spouse from 1912 and deaths including an age from 1866 changing to a date of birth in 1966. The BMD indexes do not contain the wealth of information available in the full certificate, so they shouldn't be used as a substitute for research purposes, although for minor characters on your tree, it may not hurt to wait until you can afford that extra certificate.
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