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Tableau 1

Contribution moyenne (et écart-type) par groupe et par traitement.

Mean contribution (and standard-deviation) by group and treatment.

Traitement Nombre de groupes Périodes 1–20 Périodes 1–5 Périodes 6–10 Périodes 11–15 Périodes 16–20
SI 8 28,76 (3,10) 30,15 (5,93) 29,78 (3,59) 28,08 (4,11) 27,50 (4,18)
II 7 32,19 (3,25) 34,14 (6,31) 32,89 (5,24) 30,69 (4,98) 31,09 (4,51)
IS 8 33,16 (2,28) 37,40 (5,27) 33,22 (5,66) 31,45 (4,93) 29,43 (4,43)
IC 7 35,86 (4,74) 38,91 (6,01) 36,36 (6,60) 34,49 (4,47) 32,77 (4,81)

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