Desiere Sam, D'Haese Marijke, Niragira Sanctus
1Department of Agricultural Economics,Ghent University,Coupure Links 653,9000 Gent,Belgium.
Public Health Nutr. 2015 Oct;18(15):2775-85. doi: 10.1017/S1368980015000403.
To examine the cross-sectional and inter-temporal validity of the Household Food Insecurity Access Scale (HFIAS) for rural households in Burundi.
Longitudinal survey about food security and agricultural production, individually administered by trained interviewers in June 2007 and 2012.
Ngozi, north of Burundi.
Three hundred and fourteen household heads were interviewed.
Tobit models showed that the HFIAS was significantly correlated with objective measures of food security, in this case total annual food production (P<0·01), livestock keeping (P<0·01) and coffee production (P<0·01) in both 2007 and 2012. This confirms that the HFIAS is cross-sectionally valid and corroborates the findings of previous studies. However, while total food production decreased by more than 25 % in terms of energy between 2007 and 2012, households reported an improvement in their perceived food security over the same period, with the HFIAS decreasing from 13·9 to 10·8 (P<0·001). This finding questions the inter-temporal validity of the HFIAS. It may be partly explained through response shifts, in which households assess their own food security status in comparison to that of their peers.
The evidence from our study suggests that the HFIAS is cross-sectionally valid, but may not be inter-temporally valid, and should not be used as a single indicator to study temporal trends in food security.
检验家庭粮食不安全获取量表（HFIAS）对布隆迪农村家庭的横断面有效性和跨期有效性。
关于粮食安全和农业生产的纵向调查，由经过培训的访谈员于2007年6月和2012年单独进行。
布隆迪北部的恩戈齐。
对314名户主进行了访谈。
托比特模型显示，HFIAS与粮食安全的客观指标显著相关，在这种情况下，2007年和2012年的年度粮食总产量（P<0.01）、牲畜饲养量（P<0.01）和咖啡产量（P<0.01）均与之相关。这证实了HFIAS具有横断面有效性，并佐证了先前研究的结果。然而，虽然2007年至2012年期间，按能量计算的粮食总产量下降了25%以上，但家庭报告称同期其感知到的粮食安全有所改善，HFIAS从13.9降至10.8（P<0.001）。这一发现对HFIAS的跨期有效性提出了质疑。这可能部分是由于反应偏移，即家庭与其同龄人相比评估自己的粮食安全状况。
我们研究的证据表明，HFIAS具有横断面有效性，但可能不具有跨期有效性，不应作为研究粮食安全时间趋势的单一指标。
