condition mean min max ZT0-3 10.302433 10.302433 10.302433 ZT4-7 9.859525000000001 9.859525000000001 9.859525000000001 ZT8-11 9.875741000000001 9.875741000000001 9.875741000000001 ZT12-15 10.335266 10.335266 10.335266 ZT16-19 10.965625500000002 10.965625500000002 10.965625500000002 ZT20-23 10.3622485 10.3622485 10.3622485