condition mean min max ZT0-3 810.983127 810.983127 810.983127 ZT4-7 530.242279 530.242279 530.242279 ZT8-11 160.13856800000002 160.13856800000002 160.13856800000002 ZT12-15 192.03396500000002 192.03396500000002 192.03396500000002 ZT16-19 236.4065315 236.4065315 236.4065315 ZT20-23 492.19800299999997 492.19800299999997 492.19800299999997