condition mean min max ZT0-3 217.008079 217.008079 217.008079 ZT4-7 205.271932 205.271932 205.271932 ZT8-11 195.09636849999998 195.09636849999998 195.09636849999998 ZT12-15 198.75683800000002 198.75683800000002 198.75683800000002 ZT16-19 207.216492 207.216492 207.216492 ZT20-23 256.5331635 256.5331635 256.5331635