condition mean min max ZT0-3 177.731862 177.731862 177.731862 ZT4-7 220.2481955 220.2481955 220.2481955 ZT8-11 284.427244 284.427244 284.427244 ZT12-15 355.1499205 355.1499205 355.1499205 ZT16-19 309.4758805 309.4758805 309.4758805 ZT20-23 302.43316200000004 302.43316200000004 302.43316200000004