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Northbrook, Ill. -- IPC -- Association Connecting Electronics Industries(r) announces the findings from its monthly Statistical Program. The U.S. Printed Circuit Board (PCB) Industry Book-to-Bill Ratio for April 2002 was 0.94. Sales billed (shipments) in April 2002 decreased 31.5 percent from April 2001, and orders booked decreased 10.9 percent from April 2001.Compared to 2001, bookings of PCBs are down 27.2 percent year-to-date, while shipments of PCBs are down 37.6 percent year-to-date.The ratio is calculated by averaging the number of orders booked over the past three months and dividing by the average sales billed during the same period.The PCB Business Report, an IPC statistical report that tracks the dynamics of the U.S. PCB industry, reported the PCB shipment index was 131.9 and the PCB booking index was 123.7 for April 2002. The IPC PCB shipment index in April 2002 decreased 13 percent from 151.6 in March 2002, and the IPC PCB booking index in April 2002 decreased 15.9 percent from 147.0 in March 2002.The index shows how current PCB shipments and bookings relate to an index point. (In this case, 1992 was chosen as the index point because it was a stable growth year for U.S. PCB manufacturers.) A shipment index number of 117.0 indicates that shipments are 17% higher than average shipments for the same time period in 1992.The indices are calculated by setting the base year (1992) equal to 100 and then multiplying the monthly growth rates of the actual shipments and bookings by the corresponding index number.The information in IPC's monthly industry statistics is based on data provided by both rigid and flexible PCB manufacturers that participate in IPC's monthly Statistical Program. These companies represent 60 percent of the U.S. domestic printed circuit board market. IPC publishes the Book-to-Bill Ratio and the PCB Business Report each month. (Statistics for the previous month are not available until the last week of the following month.)IPC is a U.S.-based trade association dedicated to the competitive excellence and financial success of its more than 2,600 member companies which represent all facets of the electronic interconnection industry, including design, PWB manufacturing and electronics assembly. For more information, visit www.ipc.org.