Ian Borden
Executive Vice President, Global Chief Financial Officer at McDonald's
Thanks, and good morning, everyone. As Chris mentioned just a few minutes ago, strong execution against our strategic plan delivered global comp sales of nearly 2% for the first quarter, driven by growth across our US and IOM segments. As we've said before, as customers continue to be more intentional with the dollars that they spend in a pressured economic landscape, we expect moderated top line growth this year.
In our IDL segment, positive comp sales in Japan, Europe and Latin America were offset by the impact from the ongoing war in the Middle east. We remain proud of the way our system continues to show up for customers every day, and we continue to work closely with our DL partners to support local communities in the region. It's during times like this that I'm once again reminded of the resilience of the entire McDonald's system and our ability to deliver delicious, feel good moments to our customers in any environment, which I've seen time and again in my 30 years with McDonald's.
We continued to drive a One McDonald's Way approach to our creative excellence this quarter, combining local cultural relevance with global reach to engage a new generation of McDonald's fans. In more than 30 markets around the world, including the US, we tapped into a new global community with a truly unique brand campaign. While McDonald's has long been an enduring brand across communities, in anime, we're known as WcDonald's, a fictional restaurant we brought to life for our fans this quarter.
By featuring our Chicken McNuggets, alongside a new dipping sauce, themed packaging and bonus gaming content with a mobile app purchase, we created brand excitement and lifted McNuggets category sales. Our fans passion for the McDonald's brand and for the WcDonald's universe quickly spread across social media in the US with over 6 billion impressions and nearly 100,000 mentions.
Our delicious burgers were also featured across many markets this quarter, as we continue to showcase our strength in beef with a consistent approach to improving our fan favorites. Now deployed in over 80% of our restaurants globally, best burger was recently introduced in France this quarter, delivering hotter and juicier burgers. Early results were promising with lifts across our core burger categories and improve customer satisfaction in both our taste and quality scores.
And in the US, where we're now fully deployed across the country, we celebrated the national launch of best burger with an iconic character at the center of our advertising. Tapping into the nostalgia of the Hamburglar, the campaign drove a significant lift in the Big Mac category and contributed to record customer satisfaction scores in the market. The progress we've made with our core burgers highlights what McDonald's can achieve when we tap into the full power of our system, size and scale. We'll continue to showcase that small changes can add up to deliver big improvements to both taste and quality, by scaling Best Burger to nearly all restaurants by the end of 2026.
And as we look to further build on our leadership in beef, our team of chefs from around the world have created a larger satiating burger. We'll be testing this burger in a few markets later this year, ensuring that it has universal appeal before scaling it across the globe. We also celebrated our menu in the mobile app this quarter, combining the strength of our core equities with new and exciting digital experiences for our customers. Across our top markets, digital penetration is growing, as evidenced by our increased loyalty sales and record mobile app orders, leading to greater frequency and increased spend by loyalty customers. We're also growing digital share as we leverage learnings from across markets in areas like gamification.
Australia featured McDonald's World Famous Fries at the center of a digital campaign and offered customers a chance to win by digitally redeeming their game pieces, powered by a seamless digital experience, the campaign resulted in incremental customer acquisition and increased the market's loyalty sales. The UK market also drove strong loyalty results with the return of their Winning Sips digital experience, encouraging customers to add a drink to their order with a chance to win on every cup.
Customer engagement in the mobile app increased with digitally redeemed game pieces, and we drove record growth in 90-day active users in the market. Because of unique digital experiences like Winning Sips, our loyalty members continue to engage more frequently with nearly 75% of our total loyalty user base in the UK active during the last quarter. We know the experience we provide, whether through our mobile app or in our restaurants is a significant driver of how often our customers choose to visit McDonald's. But providing our delicious food at the right price is equally critical, especially in today's environment, where consumers all over the world are paying more for everyday goods and services.
As Chris mentioned a few minutes ago, a strong value proposition continued to drive results within several of our markets this quarter. This consumer-centric approach to providing our customers with compelling value at affordable price points continue to drive strong results in markets like Germany, Spain and Poland and led to QSR market share gains. As we remain agile to meet the needs of our customers around the world, we'll continue to use our size and scale for the greatest impact, sharing what is working to drive consistency and enable speed.
Turning to the P&L. Our global top line growth drove adjusted earnings per share of $2.70 for the quarter, an increase over the prior year of about 2% in constant currencies. Adjusted operating margin for the quarter was nearly 45%. Despite the pressured consumer spending environment we've discussed this morning, top line results generated nearly $3.5 billion of restaurant margin for the quarter, an increase of about 4% in constant currency. This was partially offset by higher G&A costs as we continue to invest in our strategic transformation efforts and growth opportunities such as digital, as well as costs associated with our biennial worldwide convention that Chris mentioned.
Our adjusted effective tax rate was 19.9% for the quarter. As we've talked about before, driving long-term growth requires making the right strategic and forward-looking investments. The resilience of our business and our overall financial strength put us in the ideal position to invest in critical areas that deliver against customer needs as well as unlock efficiencies for our people and our business. This includes new restaurant development as we look to accelerate the pace of openings and grow our footprint to 50,000 restaurants by the end of 2027.
Development for the year is off to a strong start across markets, including in China, where we recently opened our 6,000th restaurant, and we are pacing on track against our global plan. In addition to restaurant development, we're also investing for long-term growth in areas like digital and technology as well as our transformation efforts within our global business services organization. By leveraging the full strength of our global scale, we'll build new and modern capabilities and ultimately unlock speed and innovation for our entire McDonald's system. Despite the headwinds that persist, we remain well positioned with the unique strength and scale that only the McDonald's system can provide.
As Chris talked about upfront, we are focused on how we can further leverage this across our consumer, restaurant and company platforms. With our system aligned on the right strategies moving forward, along with the financial strength of our franchisees, suppliers and the company, I remain confident that we will continue to deliver long-term growth for our system and for our shareholders.
And with that, let me turn it back over to Chris.