condition mean min max ZT0-3 972.909373 972.909373 972.909373 ZT4-7 962.4495440000001 962.4495440000001 962.4495440000001 ZT8-11 802.2240955 802.2240955 802.2240955 ZT12-15 885.8095965 885.8095965 885.8095965 ZT16-19 1093.9437645 1093.9437645 1093.9437645 ZT20-23 1337.5196615 1337.5196615 1337.5196615