condition mean min max ZT0-3 8.67766 8.67766 8.67766 ZT4-7 8.6165935 8.6165935 8.6165935 ZT8-11 9.043371 9.043371 9.043371 ZT12-15 10.059442 10.059442 10.059442 ZT16-19 9.5314135 9.5314135 9.5314135 ZT20-23 11.945115000000001 11.945115000000001 11.945115000000001