condition mean min max ZT0-3 6.05096 5.676285 6.425635 ZT4-7 4.90034 4.90034 4.90034 ZT8-11 6.145575 6.145575 6.145575 ZT12-15 0 0 0 ZT16-19 6.772349999999999 6.772349999999999 6.772349999999999 ZT20-23 6.714725 6.714725 6.714725