condition mean min max ZT0-3 474.529117 474.529117 474.529117 ZT4-7 381.1978055 381.1978055 381.1978055 ZT8-11 432.2071465 432.2071465 432.2071465 ZT12-15 737.5907205000001 737.5907205000001 737.5907205000001 ZT16-19 447.9228895 447.9228895 447.9228895 ZT20-23 370.90098950000004 370.90098950000004 370.90098950000004