condition mean min max ZT0-3 9.3096025 9.132195 9.487010000000001 ZT4-7 6.373785 6.373785 6.373785 ZT8-11 7.64325 7.64325 7.64325 ZT12-15 0 0 0 ZT16-19 5.7403200000000005 5.7403200000000005 5.7403200000000005 ZT20-23 8.17175 8.17175 8.17175