Min Yu
Analyst · Canaccord
Thank you, Tip, and thank you, everyone, for joining our first earnings call as a public company. I will try to keep my comments here fairly short so that we can leave more time for Q&A.
We are very pleased to report robust growth across the board, which I believe largely reflects our continued strong growth momentum and increasing operational efficiencies. The market opportunity is massive and I am confident that we have the right strategy and team in place to ideally position ourselves to benefit from the enormous growth opportunities ahead. What makes us attractive to users seeking medical aesthetic treatments in China is our ability to provide a unique value proposition with our reliable user experience. Transparent pricing, reviews and service provider credentials and convenience access to comprehensive media content, social community and online reservation functions.
This can be seen in our operational data for the quarter with average mobile MAUs increasing by 79% year-over-year to 1.92 million, total number of purchasing users increasing by 85% to 127,000 and the aggregate value of medical aesthetic treatment transactions facilitated by our platform increasing by 68% year-over-year to RMB 694 million. We also offer medical aesthetic service providers a similar unique value proposition with effective customer acquisition, differentiated branding and the improved operating efficiency. This is also reflected in our results for the quarter with the number of paying medical service providers on our platform increasing by 37% year-over-year to more than 2,700 and the number of medical service providers subscribing to information services on our platform increasing by 139% -- 136% to 1,853.
We will continue to invest in enriching our content offerings, deploying AI across our platform, developing additional value-added services, diversifying user acquisition channels and expanding into adjacent consumption healthcare verticals to strengthen our competitive advantages and fortify our position as a clear market leader.
With that, let me now quickly go over our financials for the quarter. Please be reminded that all amounts quoted here will be in RMB terms. Please also refer to our earnings release for detailed information of our comparative financial performance on a year-over-year basis.
So to start, total revenues were RMB 206 million, up 81% year-over-year. Within total revenues, information services revenue was RMB 143 million, up 103% year-over-year. Reservation services revenue was RMB 64 million, up 46% year-over-year. Costs of revenues were RMB 66 million -- RMB 36 million up 146% year-over-year, due primarily to the RMB 14 million increase in payroll costs associated with an increase in operational staff headcount.
Gross profit was RMB 170 million up 72% year-over-year. Gross margin decreased to 82.3% from 87% during the same period of last year. Total operating expenses were RMB 132 million, up 90% year-over-year.
Sales and marketing expenses were RMB 76 million, up 69% year-over-year, due primarily to share-based compensation expense, an increase in marketing and user acquisition campaigns to enhance our brand recognition and an increase in payroll costs associated with our expanding sales and marketing teams.
Research and development expenses were RMB 31 million, up 134% year-over-year. This increase was primarily due to the share based compensation expenses and increased payroll costs from our expanding R&D teams, who are developing technologies to further enhance their users and medical service provider experience. General and administrative expenses were RMB 25 million, up 124% year-over-year, due primarily to an increase in payroll cost associated with our expanding the administrative team and share-based compensation expenses.
Income from operations was RMB 38 million compared with RMB 30 million during the same period of last year. Non-GAAP income from operations was RMB 44 million compared with RMB 30 million for the first quarter of 2018. Income tax expenses were RMB 7 million compared with RMB 2.4 million during the same period of last year. The increase was primarily due to increase in taxable income during the quarter.
Net income was RMB 46 million compared with RMB 31 million during the same period of last year. Non-GAAP net income was RMB 52 million compared to RMB 31 million during the same period of last year. Basic and diluted earnings per ADS attributable to ordinary shareholders were RMB 0.28 and RMB 0.25, respectively, compared with RMB 0.36 and RMB 0.33 in the first quarter of 2018, respectively.
Next moving on to the balance sheet. As of March 31, 2019, we had total cash and cash equivalents, restricted cash and short-term investments of RMB 1.28 billion. Please note that this doesn't include the around USD 180 million we raised during our IPO earlier this month.
Now on to guidance. For the second quarter of 2019, we expect total revenues to be between RMB 260 million to RMB 280 million or USD 38.7 million to USD 41.7 million, which represents an increase of 71% to 84% year-over-year. This forecast reflects the company's current and preliminary views on the market and operational conditions, which are subject to change.
This concludes our prepared remarks. I will now turn the call to the operator and open the call for Q&A. Operator, we are ready to take questions.