Example sentences of "over a [adj] period of [num] " in BNC.

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1 In April responsibility for funding residential and nursing home care will be transferred from the Department of Social Security to local authority social services departments over a phased period of four years .
2 One other study , in which a group of 341 epidemiologists had H pylori antibody state assessed over a mean period of 8.5 years , also showed a low rate of serovonversion to a positive antibody state over time , ( 0.49% per person year ) .
3 Sickness absence records of 9072 participants ( 88% of the total sample ) were examined over a mean period of 20 ( range 0.3–39.6 ) months .
4 After the initial four weeks , patients treated with prednisolone were withdrawn from this drug over a further period of 6.5 ( 2.4 ) weeks .
5 The total number of pieces of gum used in the first day should be gradually reduced over a subsequent period of ten days .
6 Improvement was maintained over a follow-up period of six months .
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