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Table 4 Time to Repeat PT/INR Ordered by Senior Physicians

From: Comparison of warfarin therapy clinical outcomes following implementation of an automated mobile phone-based critical laboratory value text alert system

  Manual Alerts PHS Alerts P value
Interval to next PT/INR (days) Number (%) Number (%) 0.015
0-1 64 (24.7) 45 (36.3)  
2-3 38 (14.7) 8 (6.5)  
4-7 32 (12.4) 9 (7.3)  
8-30 64 (24.7) 30 (24.2)  
> 30 51 (19.7) 17 (13.7)  
N/A 10 (3.9) 15 (12.1)