condition mean min max ZT0-3 5.4511675 4.828415 6.07392 ZT4-7 4.753220000000001 4.753220000000001 4.753220000000001 ZT8-11 4.204225 4.204225 4.204225 ZT12-15 0 0 0 ZT16-19 7.943849999999999 7.943849999999999 7.943849999999999 ZT20-23 9.50235 9.50235 9.50235