condition mean min max ZT0-3 415.104566 415.104566 415.104566 ZT4-7 433.476763 433.476763 433.476763 ZT8-11 505.4816985 505.4816985 505.4816985 ZT12-15 597.8002205 597.8002205 597.8002205 ZT16-19 557.1470485 557.1470485 557.1470485 ZT20-23 599.474216 599.474216 599.474216