condition mean min max ZT0-3 9.523435 9.523435 9.523435 ZT4-7 5.630974999999999 5.630974999999999 5.630974999999999 ZT8-11 5.972315 5.972315 5.972315 ZT12-15 5.6454 5.6454 5.6454 ZT16-19 10.53555 10.53555 10.53555 ZT20-23 9.956405 9.956405 9.956405