A majority of Americans are worried about their job security, according to a new survey reported by Fast Company.

More than half, 54.5 percent, of full-time workers have increased concerns about their job security, the survey of 1,200 workers by online marketing firm Authority Hacker found. The same percentage anticipated that artificial (AI) will affect their job security within the next five years.

The proportion of those worried about job security varied by field, with those in the technology field most concerned: A whopping 90 percent of information technology (IT) workers and 74 percent of software developers were worried, followed by those in advertising (70 percent), finance and insurance (68 percent), and human resources (64 percent).

The least concerned workers were those in less tech-centric sectors, such as personal services (43 percent), transportation and warehousing (41 percent and fashion and apparel (30 percent).

Younger workers are more likely to worry about their job security, the survey found, with 62 percent of 25- to 44-year-olds worried, while fewer than half of those over the age of 45 were worried.

Men are also more likely than women to fear for their job security, by a margin of 63 percent to 48 percent. This may reflect the 3:1 gender ratio of male to female employees in tech firms, Authority Hacker speculated.

Higher-income individuals expressed higher rates of concern. Fully 72 percent of those making $150,000 or more were worried about their job security, while only half of those making $50,000 or less were worried. In line with those findings, 79 percent of C-suite executives are worried about their job security, while just 47 percent and 46 percent of nonmanagement staff and administrative staff, respectively, are worried about their job security.

The larger the company is, the more likely employees are to worry about their job security, the survey found; three- quarters of employees at companies that employ between 500 and 1,000 workers worried about their job security, while fewer than half, 45 percent, of workers at companies with 25 or fewer employees were worried.