condition mean min max ZT0-3 148.390533 148.390533 148.390533 ZT4-7 154.7286945 154.7286945 154.7286945 ZT8-11 130.001288 130.001288 130.001288 ZT12-15 129.3474415 129.3474415 129.3474415 ZT16-19 100.7272535 100.7272535 100.7272535 ZT20-23 114.491834 114.491834 114.491834