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This research investigated the performance of the red, octagonal Vienna Convention traffic 'STOP' sign as a front of pack (FoP) warning nutritional label. While the Vienna Convention traffic light system is an established FoP label, the potential of the 'STOP' sign in the role has not been investigated. The performance of the 'STOP' label was compared with that of a single star (low nutritional value) Australasian Health Star Rating (HSR) label using a fractionally replicated Latin square design. The labels were presented on choice diads of cold breakfast cereal packets. The sample of 240 adolescents aged 16-18 was drawn from a secondary school in the South Island of New Zealand. A large and significant main effect was observed at the p &lt; 0.01 level for the difference between the 'STOP' sign and the control condition (no nutritional FoP label), and at p &lt; 0.05 for the difference between the HSR and the 'STOP' label. There was no significant difference between the HSR FoP and the control condition. A significant non-additivity (interaction) ( p &lt; 0.01) was also observed via the fractional replication. The results indicate that the Vienna Convention 'STOP' sign is worthy of further research with regard to its potential as an FoP nutritional label.

An Experimental Comparison of the Impact of ‘Warning’ and ‘Health Star Rating’ FoP Labels on Adolescents’ Choice of Breakfast Cereals in New Zealand