Thank you, Julie, and good morning everyone. It is once again my pleasure to be with you with this morning to review our second quarter financial results. As usual, my comments this morning regarding total company and healthcare results will be based on adjusted figures. Please see the reconciliation table included in our press release for additional details.
Let me now begin with a review of our second quarter income statement. Total revenue grew 14% during the second quarter, driven by a 10% increase from acquisitions, a 3% increase in organic volume and a 1% improvement in pricing. Foreign currency was neutral to revenue during the quarter.
Gross margin, at 40.3%, represents an increase of 90 basis points over the prior year. The increase is driven by 140 basis points from acquisitions and 60 basis points from price. This increase was somewhat offset by our investments in in-sourcing along with the medical device excise tax, each of which was approximately $2 million.
EBIT improved $7.8 million in the quarter. EBIT at 14.3% of revenue increased both sequentially and year-over-year. Year-over-year, EBIT as a percent of revenue increased 30 basis points as gross margin improvements were somewhat offset by higher R&D expenses.
R&D expense in the quarter increased $3.7 million compared to the prior year and includes almost $1 million related to a disallowance of foreign R&D government subsidies. The effective tax rate in the quarter was 35.2% compared with 29.4% last year. The prior year tax rate is lower due to the timing of discrete item adjustments. As a result, net income increased to $32.6 million or $0.55 per diluted share compared with $30.9 million or $0.53 per diluted share last year.
Moving on to our segment results, healthcare revenue in the quarter grew 17%. Healthcare capital equipment revenue grew 3% including a negative 1% impact from our SYSTEM 1E year-over-year unit sales decline. This is our final quarter to be impacted by the SYSTEM 1, 1E transition.
Healthcare consumable revenue increased 26%, driven by both acquisitions and organic growth. Consumable organic growth during the quarter was a positive 3%. Service revenue grew 34%, driven by both acquisitions and organic growth. Service organic growth during the quarter increased 6%. Healthcare backlog increased double digits both sequentially and year-over-year, ending the quarter at $133 million. Healthcare operating income increased 14% to $30.3 million in the second quarter.
The increase in operating income year-over-year was primarily driven by the acquisitions and increased volume. This increase was somewhat offset by the medical device excise tax, increased R&D expense and investments in in-sourcing.
Life Sciences revenue increased 7% during the quarter. Consumable revenue had another good quarter of growth, up 8%, while service revenue was flat. Capital equipment revenue grew 13% in the quarter and, as per usual, capital equipment shipments within this segment tend to vary from quarter-to-quarter.
Backlog in Life Sciences ended the quarter at $47.8 million, a decline of 6% compared with the prior year but an increase of 7% compared to the first quarter. Life Sciences' second quarter operating income set an all-time high at 24.1% of revenue. While we are pleased with this quarter's operating margin rate, it was unusually high, as we experienced a very favorable gross-margin mix within Life Sciences' capital equipment business.
Revenue for Isomedix increased 7% in the quarter to $47.4 million. Isomedix operating margin was 28.9% of revenue, an increase of 30 basis points as compared to the prior year. During the quarter we did have success in filling our expanded capacity. However, at the same time, we did have several chambers offline during the quarter for maintenance purposes and did experience higher repairs and maintenance costs, both of which did have a slight drag on our operating margin in the quarter.
In terms of the balance sheet, we ended the quarter with $164 million of cash and $509 million in long-term debt. We remain comfortable with our current leverage profile of total debt to capital of 34% and total debt to EBITDA of 1.7x.
Our free cash flow for the first 6 months was $32.9 million compared with $67 million in the prior year. The decline in free cash flow is primarily due to the payments of our annual incentive compensation program, which did not occur in the prior year, as well as the impact of strong working capital improvements in the prior year. Capital spending was $25.4 million in the quarter while depreciation and amortization was $17.8 million.
With that, I will now turn the call over to Walt for his remarks. Walt?