condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 11.36308 11.36308 11.36308 ZT8-11 11.028967 11.028967 11.028967 ZT12-15 11.092382 11.092382 11.092382 ZT16-19 11.9024675 11.9024675 11.9024675 ZT20-23 10.916118 10.916118 10.916118