condition mean min max ZT0-3 643.382546 643.382546 643.382546 ZT4-7 627.7379834999999 627.7379834999999 627.7379834999999 ZT8-11 576.7570685000001 576.7570685000001 576.7570685000001 ZT12-15 621.5462660000001 621.5462660000001 621.5462660000001 ZT16-19 639.760378 639.760378 639.760378 ZT20-23 476.4009065 476.4009065 476.4009065