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In a time-stratified case-crossover design, each case's controls are selected from the same time stratum as the case, and seasonal effects and long-term time trends are assumed to vary inconsequentially within each time stratum.
Agendas varied.
Desserts varied.
Reactions varied.
It varied.
Attitudes varied.
A team placed pond snails (Lymnaea stagnalis, like the one above) in water-filled beakers that varied in stressfulness: Some were overcrowded, some contained water low in calcium (stressful, for a snail), and some were both overcrowded and low in calcium; the beakers varied inconsequentially in oxygen levels.
Results varied.
Punishment varied.
Opinions varied.
Local media reports varied.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com