condition mean min max ZT0-3 1647.971183 1647.971183 1647.971183 ZT4-7 2057.959813 2057.959813 2057.959813 ZT8-11 1996.3709680000002 1996.3709680000002 1996.3709680000002 ZT12-15 1802.3239330000001 1802.3239330000001 1802.3239330000001 ZT16-19 2099.064661 2099.064661 2099.064661 ZT20-23 2077.251969 2077.251969 2077.251969