1 Exhibit 11 Meridian Diagnostics, Inc. and Subsidiaries Computation of Earnings Per Common Share For the Periods Ended September 30, 1997, 1996 and 1995 Weighted Avg. Number of Earnings Per Common Shares Outstanding Net Income Common Share Use ------------------------- ---------- ------------ --- YEAR ENDED SEPTEMBER 30, 1997: Shares Outstanding October 1, 1996 14,278,578 $ -- $ -- Weighted average shares issued during fiscal 1997 (86,711 shares) 63,207 -- -- Net Income -- 5,982,085 -- ---------- ---------- -------- Primary Earnings Per Common Share 14,341,785 $5,982,085 $ 0.4171 $0.42 ===== Effect of outstanding stock options which is less than 3% and not required to be disclosed in financial statements (645,441 shares) 319,427 -- -- ---------- ---------- -------- 14,661,212 $5,982,085 $ 0.4080 Additional effect of stock options at year- end stock price 60,289 -- -- ---------- ---------- -------- Fully Diluted Earnings Per Common Share 14,721,501 $5,982,085 $ 0.4064 ========== ========== ========== YEAR ENDED SEPTEMBER 30, 1996: Shares Outstanding October 1, 1995 12,924,814 $ -- $ -- Weighted average shares issued during the period (1,353,764 shares) 1,247,169 -- -- Net Income -- 5,292,175 -- ---------- ---------- -------- 14,171,983 $5,292,175 $ 0.3734 Effect of outstanding stock options (777,586 shares) 495,105 -- -- ---------- ---------- -------- Primary Earnings Per Common Share 14,667,088 $5,292,175 $ 0.3608 $0.36 ===== Effect of 1993 convertible debentures 90,566 26,824 -- ---------- ---------- -------- 14,757,654 $5,318,999 $ 0.3604 Additional effect of stock options at year-end stock price 2,619 -- -- ---------- ---------- -------- Fully Diluted Earnings Per Common Share 14,760,273 $5,318,999 $ 0.3604 ========== ========== ========= YEAR ENDED SEPTEMBER 30, 1995: Shares Outstanding October 1, 1994 12,292,935 $ -- $ -- Weighted average shares issued during the period (638,237 shares) 66,237 -- -- Weighted average shares redeemed for cash as a result of stock dividend (398 shares) (320) -- -- Treasury shares repurchased (6,291 shares) (4,100) -- -- Net Income -- 3,524,111 -- ---------- ---------- -------- Primary Earnings Per Common Share 12,354,752 $3,524,111 $ 0.2852 $0.29 ===== Effect of outstanding stock options which is less than 3% and not required to be disclosed in financial statements (663,553 shares) 318,872 -- -- ---------- ---------- -------- 12,673,624 $3,524,111 $ 0.2781 Effect of convertible debentures 1,832,891 489,760 -- ---------- ---------- -------- 14,506,515 $4,013,871 $ 0.2767 Additional effect of stock options at year-end stock price 35,088 -- -- ---------- ---------- -------- Fully Diluted Earnings Per Common Share 14,541,603 $4,013,871 $ 0.2760 $0.28 ========== ========== ======== =====