condition mean min max ZT0-3 8.450095 2.457505 13.636 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 1.0992225 0.0 2.198445 ZT16-19 2.183405 2.183405 2.183405 ZT20-23 2.462025 2.462025 2.462025