condition mean min max ZT0-3 503.665322 503.665322 503.665322 ZT4-7 417.75016700000003 417.75016700000003 417.75016700000003 ZT8-11 333.368808 333.368808 333.368808 ZT12-15 406.714781 406.714781 406.714781 ZT16-19 439.39966749999996 439.39966749999996 439.39966749999996 ZT20-23 384.7894915 384.7894915 384.7894915