condition mean min max ZT0-3 10.2214825 9.034165 11.4088 ZT4-7 6.36373 6.36373 6.36373 ZT8-11 6.302205 6.302205 6.302205 ZT12-15 0 0 0 ZT16-19 8.573409999999999 8.573409999999999 8.573409999999999 ZT20-23 10.33536 10.33536 10.33536