condition mean min max ZT0-3 343.927471 343.927471 343.927471 ZT4-7 330.515787 330.515787 330.515787 ZT8-11 293.6151075 293.6151075 293.6151075 ZT12-15 338.3307315 338.3307315 338.3307315 ZT16-19 464.9445385 464.9445385 464.9445385 ZT20-23 428.562814 428.562814 428.562814