Assuming there is no shortage of vaccine this flu season, most employees of major companies in the Washington area apparently can count on getting a shot at the office.

Free or subsidized flu shots were offered by 53 percent of businesses responding to an annual compensation survey by the Human Resource Association of the National Capital Area. That made it the most common perk listed.

A close second was the right to go suitless -- 38 percent of local businesses surveyed permitted casual dress every day. Eleven percent offered on-site therapeutic massage. Two percent offered retreats in resort locations while 1 percent provided workers a personal shopper.

The bulk of the bulky survey released last week is a job-by-job report on salary trends for 311 positions in the area, everything from plumber and bank teller to general counsel and librarian. But the results for each job reflect a smaller subsample and some carried surprising conclusions.

For example, the survey found that the median salary for waiters jumped 52 percent since last year and that dishwashers cleaned up, taking in 35 percent more cash. On the other hand, stock clerks' median pay supposedly dipped 46 percent in a year, and checks for "word-processing operators" shrank by 28 percent.

But before you skimp on your next tip, you might want to ask whether your server participated in this purported wage boom.

Sergio Toni, owner of Silver Spring institution Sergio Ristorante Italiano, said wages at his establishment have gone up "cents" since last year, although he hastened to add that his staff is well-compensated and enjoys an annual two-week vacation while he visits his mother in Italy.

Wide fluctuations are not uncommon with salary surveys, which vary according to which companies respond each year. For waiters, for example, the results were drawn from nine responses in the "hospitality, transportation, services" category. And some of those responses were from companies such as Long & Foster Real Estate, the Washington Convention Center and AvalonBay Communities Inc. Unlike Sergio Toni's restaurant, none is known for its veal piccata.

-- Annys Shin