The phrase "at a weekly interval" is correct and can be used in written English.
It refers to something occurring or happening every week. Example: The team meets at a weekly interval to discuss their progress and brainstorm new ideas.
We conducted phenological censuses from May 2008 to July 2009, visiting each of the 29 trees at a weekly interval (the average was 8.2 days between censuses).
The typical dosage of propranolol is 40 mg ×2, increased at a weekly interval to a maximum of 120 mg ×2.
Thus scores were made visually as well as using photographs of each mouse at a weekly interval.
Each plant was mechanically inoculated with SCMV twice and scored at a weekly interval to evaluate resistance to SCMV.
The intervention group receives three patient-guided focussed medium-energy density ESWT treatments without local anaesthesia at a weekly interval in the first half of the competition.
Higher doses administered twice at a weekly interval (200 × 10), or just once (600 × 10) induced full protection for the i.v. and s.c. route, but only protected 60 80% of the mice for the i.d.
Thus, 14 patients in total were treated at 120 mg m−2: 11 at a 3 weekly interval and three patients who received the drug at a 4 weekly interval.
Slightly more than half (53.3 %) of home-ePRO patients considered at least a weekly assessment interval for home monitoring reasonable; one fourth (24.4 %) stated a monthly interval to be sufficient.
Tumor growth was measured with a caliper at weekly intervals, and the volume was calculated using a modified ellipsoidal formula: Tumor volume = 1/2(L × W 2 ) where L is the longitudinal diameter and W is the transverse diameter.
three times at weekly intervals at a DXR equivalent dose of 2.2 mg kg−1.
If an acceptable response was not achieved, doses were increased in a stepwise manner at weekly intervals at visits 1 3.
