Map built using ordinary kriging interpolation method.

<p>This analysis is based on the HI values of 94 “départements”.</p

Correlogram showing the Moran’s intercorrelation index (I) according to distance.

<p>This analysis is based on the HI values of 94 “départements”.</p

Number of responses for kissing sequences starting by the right cheek and the left cheek, in each “département” (results of the website “combiendebises”).

<p>see legend for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0124477#pone.0124477.t003" target="_blank">Table 3</a>. Only the “départements” that display a significant bias are represented. All the other “départements” have similar numbers of right and left responses.</p><p>Number of responses for kissing sequences starting by the right cheek and the left cheek, in each “département” (results of the website “combiendebises”).</p

Number of kissing sequences starting by the right cheek and the left cheek, in each city.

<p>Right cheek: number of kissing sequences starting by the right cheek. Left cheek: number of kissing sequences starting by the left cheek. Majority types are in bold. Sum: total number of data points. B test: p value of the Binomial test performed on the number of right versus left. HI and absHI values. Lateral bias: group-level bias, based on the B test. % majority type: percentage of people displaying the majority type behaviour. Adj prob: adjusted probability for kissing the left cheek, based on the likelihood-ratio test and lsmeans.</p><p>Number of kissing sequences starting by the right cheek and the left cheek, in each city.</p

Frequency of the kissing sequences (1 kiss sequences, 2 kisses sequences, 3 kisses sequences, 4 kisses sequences) according to laterality, sex and age, in Montpellier.

<p>The adjusted probabilities of the kissing sequences, based on the likelihood-ratio test and lsmeans, are given in brackets.</p><p>Frequency of the kissing sequences (1 kiss sequences, 2 kisses sequences, 3 kisses sequences, 4 kisses sequences) according to laterality, sex and age, in Montpellier.</p

Percentage of kissing sequences starting by the right cheek (grey) and the left cheek (open bar), in each of the cities.

<p>Letters represent the differences between cities, based on the Generalized Linear Model analysis: different letters between two cities indicate a significant difference, similar letters indicate no difference.</p

Number of responses for kissing sequences starting by the right cheek and the left cheek, in each city (results of the online questionnaire).

<p>see legend for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0124477#pone.0124477.t003" target="_blank">Table 3</a>.</p><p>Number of responses for kissing sequences starting by the right cheek and the left cheek, in each city (results of the online questionnaire).</p

Frequency of the kissing sequences according to age, in Montpellier.

<p>The kissing sequences are: 1 kiss sequences (grey), 2 kisses sequences (black), 3 kisses sequences (open bar). Letters represent the differences between age classes, based on the Proportional Odds Model analysis: different letters between two classes indicate a significant difference, similar letters indicate no difference.</p

Map presenting the results of the direct observations and the results of the website “combiendebises” (http://combiendebises.free.fr) (how many kisses).

<p>City names show the results of the direct observations, which are based on cities. Green represents right biases and red represents left biases. Background colours show the results of the internet website, which are based on “départements”.</p