By definition, the etiology of primary osteoarthritis is unknown, but the pathology and pathogenesis of osteoarthritis have been extensively studied. [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15] Historically, osteoarthritis has been divided into primary and secondary forms, although this division is somewhat artificial.
What's your relationship to the couple? - While the average gift ranges from $50 to $100 for those under 30, expect to spend $100 or more if you're close friends with the couple and are more established financially. For your nearest and dearest friends and relatives, gift costs can range from over a $100 to $200 or more.
The average amount spent on gifts this year will be about $109 per wedding, but nearly twice that if the bride or groom is a close family member. And, of course, it's not just guests that are dropping serious cash on the Big Day. According to The Knot's 2013 Real Weddings report, marrying couples are now shelling out $30,000 on average for their weddings and spending an average of $220 per guest.