The demographic characteristics of all donors among the six blood centers were collected and analyzed (Table 3) according to and including donor status (first time donors vs repeat donors), gender, age, occupation and education. First-time donors were defined as donors who had no record on file according to the blood center databases. Repeat donors were donors who had a previous record in the databases of the blood centers.Table 3Demographic Characteristics of all Donors Across Six Blood Centers from June, 2014 to July, 2015Blood CentersAnhuiDalianChangzhiKaifengMianyangFujianDonors Status First-Time60,812(62.26%)38,503(49.75%)10,643(32.43%)40,227(67.11%)18,889(41.52%)43,384(51.92%) Repeat36,856(37.74%)38,892(50.25%)22,174(67.57%)19,711(32.89%)26,605(58.48%)40,170(48.08%)Gender Male65,105(66.66%)48,496(62.66%)20,790(63.35%)38,942(64.97%)27,742(60.98%)50,124(59.99%) Female32,563(33.34%)28,899(37.34%)12,027(36.65%)20,996(35.03%)17,752(39.02%)33,430(40.01%)Age Group 18~2542,212(43.22%)32,597(42.12%)2701(8.23%)11,688(19.50%)9313(20.47%)28,450(34.05%) 25~3527,328(27.98%)21,421(27.68%)7269(22.15%)15,740(26.26%)10,150(22.31%)21,933(26.25%) 35~4518,762(19.21%)15,439(19.95%)13,199(40.22%)19,234(32.09%)16,005(35.18%)20,989(25.12%) 45~558907(9.12%)7536(9.74%)8765(26.71%)11,976(19.98%)9276(20.39%)10,854(12.99%) 55~60459(0.47%)402(0.52%)883(2.69%)1301(2.17%)751(1.65%)1329(1.58%)Occupation Farmers5801(5.94%)3243(4.19%)12,270(37.39%)16,405(27.37%)5687(12.50%)2565(3.07%) Workers10,206(10.45%)12,027(15.54%)5907(18.00%)11,286(18.83%)4841(10.64%)2423(2.90%) Students23,020(23.57%)18,103(23.39%)1414(4.31%)5580(9.31%)4599(10.11%)14,647(17.53%) Soldiers1845(1.89%)859(1.11%)98(0.30%)623(1.04%)641(1.41%)1504(1.80%) Teachers2724(2.79%)410(0.53%)755(2.30%)468(0.78%)1210(2.66%)/ Civil Servants3437(3.52%)186(0.24%)1195(3.64%)336(0.56%)1843(4.05%)4278(5.12%) Doctors4189(4.29%)573(0.74%)597(1.82%)2242(3.74%)3071(6.75%)3175(3.81%) Staff24,026(24.60%)2748(3.55%)2110(6.44%)22,914(38.23%)3662(8.05%)19,518(23.36%) Other22,414(22.95%)39,247(50.71%)8470(25.81%)84(0.14%)19,940(43.83%)35,444(42.42%)Education Below High School18,645(19.09%)22,174(28.65%)15,765(48.04%)21,799(36.37%)14,185(31.18%)31,458(37.65%) High School and42,662(43.68%)21,733(28.08%)14,407(43.90%)30,784(51.36%)22,893(50.32%)23,111(27.66%)Associate Degree Bachelor’s Degree22,044(22.57%)20,726(26.78%)2543(7.75%)5556(9.27%)7670(16.86%)28,525(34.14%) Master’s Degree3340(3.42%)805(1.04%)30(0.09%)1091(1.82%)669(1.47%)460(0.55%) Others10,977(11.24%)11,958(15.45%)72(0.22%)707(1.19%)77(0.17%)/ Sum up97,66877,39532,81759,93845,49483,554 Total396,866