condition mean min max ZT0-3 894.674461 894.674461 894.674461 ZT4-7 755.6184165 755.6184165 755.6184165 ZT8-11 766.110352 766.110352 766.110352 ZT12-15 851.9082075000001 851.9082075000001 851.9082075000001 ZT16-19 666.8837075 666.8837075 666.8837075 ZT20-23 931.4023480000001 931.4023480000001 931.4023480000001