condition mean min max ZT0-3 23.745689 23.745689 23.745689 ZT4-7 17.937236 17.937236 17.937236 ZT8-11 15.969761 15.969761 15.969761 ZT12-15 16.7786905 16.7786905 16.7786905 ZT16-19 10.751131 10.751131 10.751131 ZT20-23 12.3858535 12.3858535 12.3858535