condition mean min max ZT0-3 105.752517 105.752517 105.752517 ZT4-7 100.577085 100.577085 100.577085 ZT8-11 204.5123365 204.5123365 204.5123365 ZT12-15 195.836685 195.836685 195.836685 ZT16-19 207.693235 207.693235 207.693235 ZT20-23 225.440581 225.440581 225.440581