Lost Time Injury Meaning – Understanding LTI and Its Importance in Safety

What is Lost Time Injury (LTI)?

A “Lost Time Injury” (LTI) is a term used in workplaces, especially in industries like construction or manufacturing. It refers to an injury that happens at work and is severe enough to make the worker unable to perform their regular duties for a certain time. This means they have to take time off work to recover.

For example, if a worker falls from a ladder and injures a leg, they might be unable to return to work for several weeks. This would be considered a Lost Time Injury because the injury sustained resulted in ‘lost time’. This is an important metric of safety performance.

Companies track these injuries to understand how safe their workplace is. A high lost time injury rate can indicate that a workplace is unsafe and that changes need to be made to prevent more injuries.

Common Types of Lost Time Injury

Lost time injuries are incidents that occur at work, causing an employee to miss future work days. These injuries can be severe and often require medical attention. Here are some common types of lost time injuries:

1.     Slips, Trips, and Falls

These are the most common workplace accidents. They can happen due to wet floors, cluttered workspaces, or uneven surfaces.

2.     Struck by Object

This happens when a worker is hit by an object, which could be falling, swinging, or rolling.

3.     Overexertion Injuries

These injuries occur when a worker pushes their body beyond its limit. It could be from lifting heavy objects, repetitive motions, or working in awkward positions.

4.     Vehicle Accidents

Workers who drive for their jobs may get into road accidents, leading to serious injuries.

5.     Falls from Height

This type of injury occurs when a worker falls from a high place like a ladder, roof, or scaffold.

6.     Machinery Accidents

Heavy machinery workers risk getting caught in or struck by the equipment.

7.     Repetitive Strain Injury (RSI)

This is caused by repeated movements over time, leading to pain and damage to muscles, nerves, and tendons.

8.     Workplace Violence

Sadly, physical altercations or attacks can also lead to LTIs.

How to Calculate Lost Time Injury Frequency Rate (LTIFR)?

The Lost Time Injury Frequency Rate (LTIFR) is a measure used in many industries to assess safety performance. It represents the number of lost time injuries that occur per million hours worked. Here’s how you can calculate it:

Step 1: Identify the Number of Lost Time Injuries

First, you need to know the total number of LTIs in a given period. Again, a lost time injury is any injury that causes a worker to miss work beyond the day of the injury.

Step 2: Determine the Total Hours Worked

Next, find out the total number of hours worked by all employees during the same period. This includes regular hours, overtime, and training hours.

Step 3: Calculate LTIFR

Finally, use the following formula to calculate LTIFR:

LTIFR = (Number of lost time injuries / Total hours worked) x 1,000,000

Lost Time Incident Rate LTIR

For example, if there were 2 lost time injuries and 500,000 total hours worked, the LTIFR would be:

LTIFR = (2 / 500,000) x 1,000,000 = 4

This means there were 4 lost time injuries for every million hours worked.

Remember, a lower LTIFR indicates a safer work environment. Regularly calculating and monitoring your LTIFR can help identify areas for improvement in your workplace safety program.

Case Study with Lost Time Injury Calculation

This case study will examine an actual LTI event to understand its causes and how it could have been prevented.

John, a warehouse worker, was injured along with 4 other workers while operating a forklift. He was moving heavy boxes when some boxes fell off the pallet due to his negligence. John suffered a broken toe, and others had severe injuries that they were all unable to work for three weeks.

The Case Study and Calculations

Case Study:

ABC Manufacturing Company had a total of 200 employees. In the past year, there were 5 lost time injuries reported. Each injured worker was absent for an average of 20 days.

Explanation and Calculations:

Lost Time Injury Frequency Rate (LTIFR)

The Lost Time Injury Frequency Rate (LTIFR) is a measure used to help businesses identify the frequency of LTIs within a certain period. It’s calculated using the following formula:

LTIFR = (Number of LTI / Total hours worked) x 1,000,000

Assuming each employee works 8 hours a day, 5 days a week, for 50 weeks a year, the total hours worked by all employees in a year would be:

200 employees 8 hours/day, 5 days/week * 50 weeks/year = 400,000 hours

So, the LTIFR for ABC Manufacturing Company would be:

LTIFR = (5 LTI / 400,000 hours) x 1,000,000 = 12.5

This means that for every 1,000,000 hours worked, there were 12.5 lost time injuries.

Causes of the Incident

Several factors contributed to this accident:

Improper Stacking: The boxes were stacked too high, making them unstable.

Lack of Training: John had not received proper training on how to handle such situations.

Inadequate Safety Equipment: John was not wearing steel-toed boots, which could have protected his foot. There’s also no safety signage to warn other workers to be aware of possible dangers.

Preventive Measures

To prevent similar incidents and further minimize lost time injuries in the future, the following measures should be implemented:

Proper Training: All employees should receive comprehensive safety training, including how to correctly stack boxes and safely operate machinery with proper supervision.

Safety Equipment: Employees should be provided with and required to wear appropriate personal protective equipment, like steel-toed boots.

Regular Inspections: Regular checks should be conducted to ensure all safety protocols are being followed.

Image represent the barricades and precaution to preventive measures.

This case study shows that LTIs can be prevented with proper training, use of safety equipment, and adherence to safety protocols. By learning from John’s unfortunate incident, we can create a safer workplace for everyone.

Importance of Lost Time Injury in the Industry

Employee Health and Safety: The most important reason LTIs are taken seriously is because they directly impact the health and safety of workers. No job should put a person’s well-being at risk.

Workplace Morale: When workers see that injuries are causing their colleagues to miss work, it can make them feel unsafe and less motivated.

Financial Cost: Injuries that cause lost time also mean financial losses for companies. They have to pay for medical expenses, cover for the absent worker, and might face legal issues if they don’t keep their workplace safe.

Productivity: With workers out due to injury, productivity can drop. This means tasks take longer to complete, and deadlines might be missed.

Reputation: Companies with high LTIs may get a bad reputation. This can lead to difficulty in hiring skilled workers or retaining staff.


Image represent Lost Time Injury | Dark around the Time

Understanding and tracking Lost Time Injuries is crucial for any business. It helps identify safety issues, manage costs, comply with regulations, and maintain staff morale.

By understanding its importance and actively working to reduce LTIs, industries can create safer workplaces, improve productivity, save costs, enhance their reputation, and ensure regulatory compliance.

By calculating the LTIFR, companies can get a clear picture of their safety performance and take necessary steps to improve it.

Remember, a safe workplace is a legal requirement and a key factor in a company’s success.

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