I did research on Stryker, I found:
SYK Gross Profit Margin (Quarterly) Range, Past 5 Years:
Minimum 64.47%
Maximum 68.29%
Average 66.37%
Net Profit Margin (Quarterly):12.98%
Return on Equity (ROE):17.81%
Return on invested capital (ROIC): 12.93%
Return On Investment (ROI): 4.88% (Jun 30 2017)
40.95% (Mar 31 2017)
39.83% (Dec 31 2016)

Stryker sales doesn’t go high as I thought!. the GPM-Average in the past 5 years almost the same ratio!. Net Profit Ratio seems to be good.

https://ycharts.com/companies/SYK/gross_profit_margin
https://csimarket.com/stocks/SYK-Return-on-Investment-ROI.html