condition mean min max ZT0-3 9.414129 9.414129 9.414129 ZT4-7 9.063490999999999 9.063490999999999 9.063490999999999 ZT8-11 10.1699625 10.1699625 10.1699625 ZT12-15 10.081134 10.081134 10.081134 ZT16-19 10.428755500000001 10.428755500000001 10.428755500000001 ZT20-23 10.230371 10.230371 10.230371